kopia lustrzana https://github.com/jameshball/osci-render
622 wiersze
29 KiB
C++
622 wiersze
29 KiB
C++
/*
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==============================================================================
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This file is part of the JUCE library.
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Copyright (c) 2020 - Raw Material Software Limited
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JUCE is an open source library subject to commercial or open-source
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licensing.
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By using JUCE, you agree to the terms of both the JUCE 6 End-User License
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Agreement and JUCE Privacy Policy (both effective as of the 16th June 2020).
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End User License Agreement: www.juce.com/juce-6-licence
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Privacy Policy: www.juce.com/juce-privacy-policy
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Or: You may also use this code under the terms of the GPL v3 (see
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www.gnu.org/licenses).
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JUCE IS PROVIDED "AS IS" WITHOUT ANY WARRANTY, AND ALL WARRANTIES, WHETHER
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EXPRESSED OR IMPLIED, INCLUDING MERCHANTABILITY AND FITNESS FOR PURPOSE, ARE
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DISCLAIMED.
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==============================================================================
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*/
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#include "JuceHeader.h"
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namespace juce {
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namespace jc {
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//==============================================================================
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/**
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A subclass of this is used to drive a ListBox.
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@see ListBox
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@tags{GUI}
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*/
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class ListBoxModel {
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public:
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//==============================================================================
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/** Destructor. */
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virtual ~ListBoxModel() = default;
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//==============================================================================
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/** This has to return the number of items in the list.
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@see ListBox::getNumRows()
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*/
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virtual int getNumRows() = 0;
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/** This method must be implemented to draw a row of the list.
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Note that the rowNumber value may be greater than the number of rows in your
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list, so be careful that you don't assume it's less than getNumRows().
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*/
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virtual void paintListBoxItem(int rowNumber, Graphics& g, int width, int height, bool rowIsSelected) = 0;
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/** This is used to create or update a custom component to go in a row of the list.
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Any row may contain a custom component, or can just be drawn with the paintListBoxItem() method
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and handle mouse clicks with listBoxItemClicked().
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This method will be called whenever a custom component might need to be updated - e.g.
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when the list is changed, or ListBox::updateContent() is called.
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If you don't need a custom component for the specified row, then return nullptr.
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(Bear in mind that even if you're not creating a new component, you may still need to
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delete existingComponentToUpdate if it's non-null).
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If you do want a custom component, and the existingComponentToUpdate is null, then
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this method must create a suitable new component and return it.
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If the existingComponentToUpdate is non-null, it will be a pointer to a component previously created
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by this method. In this case, the method must either update it to make sure it's correctly representing
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the given row (which may be different from the one that the component was created for), or it can
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delete this component and return a new one.
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The component that your method returns will be deleted by the ListBox when it is no longer needed.
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Bear in mind that if you put a custom component inside the row but still want the
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listbox to automatically handle clicking, selection, etc, then you'll need to make sure
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your custom component doesn't intercept all the mouse events that land on it, e.g by
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using Component::setInterceptsMouseClicks().
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*/
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virtual Component* refreshComponentForRow(int rowNumber, bool isRowSelected, Component* existingComponentToUpdate);
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/** This can be overridden to react to the user clicking on a row.
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@see listBoxItemDoubleClicked
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*/
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virtual void listBoxItemClicked(int row, const MouseEvent&);
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/** This can be overridden to react to the user double-clicking on a row.
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@see listBoxItemClicked
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*/
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virtual void listBoxItemDoubleClicked(int row, const MouseEvent&);
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/** This can be overridden to react to the user clicking on a part of the list where
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there are no rows.
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@see listBoxItemClicked
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*/
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virtual void backgroundClicked(const MouseEvent&);
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/** Override this to be informed when rows are selected or deselected.
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This will be called whenever a row is selected or deselected. If a range of
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rows is selected all at once, this will just be called once for that event.
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@param lastRowSelected the last row that the user selected. If no
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rows are currently selected, this may be -1.
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*/
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virtual void selectedRowsChanged(int lastRowSelected);
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/** Override this to be informed when the delete key is pressed.
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If no rows are selected when they press the key, this won't be called.
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@param lastRowSelected the last row that had been selected when they pressed the
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key - if there are multiple selections, this might not be
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very useful
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*/
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virtual void deleteKeyPressed(int lastRowSelected);
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/** Override this to be informed when the return key is pressed.
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If no rows are selected when they press the key, this won't be called.
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@param lastRowSelected the last row that had been selected when they pressed the
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key - if there are multiple selections, this might not be
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very useful
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*/
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virtual void returnKeyPressed(int lastRowSelected);
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/** Override this to be informed when the list is scrolled.
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This might be caused by the user moving the scrollbar, or by programmatic changes
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to the list position.
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*/
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virtual void listWasScrolled();
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/** To allow rows from your list to be dragged-and-dropped, implement this method.
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If this returns a non-null variant then when the user drags a row, the listbox will
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try to find a DragAndDropContainer in its parent hierarchy, and will use it to trigger
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a drag-and-drop operation, using this string as the source description, with the listbox
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itself as the source component.
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@see DragAndDropContainer::startDragging
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*/
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virtual var getDragSourceDescription(const SparseSet<int>& rowsToDescribe);
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/** You can override this to provide tool tips for specific rows.
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@see TooltipClient
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*/
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virtual String getTooltipForRow(int row);
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/** You can override this to return a custom mouse cursor for each row. */
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virtual MouseCursor getMouseCursorForRow(int row);
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/**
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* Override this to return the row height for a given row.
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*/
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virtual int getRowHeight(int row) { return 22; }
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/**
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* Override this if your list may have variable row heights.
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*
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* Performance is slightly improved if this returns false, but getRowHeight
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* must then return the same number for all rows.
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*/
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virtual bool hasVariableHeightRows() const { return false; }
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/**
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* You can override this to improve performance with very long lists.
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*
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* If you have many variable height rows you may be able to improve
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* performance by directly calculating the row for a given y position.
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*
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* If the y position is greater than the number of rows return the number
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* of rows. yPos will never be less than zero.
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*/
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virtual int getRowForPosition(int yPos);
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/**
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* You can override this to improve performance with very long lists.
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*
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* If you have a large number (e.g. thousands of) variable height rows you
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* may be able to improve performance by overriding this function and
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* directly calculating the y position of a given row.
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*/
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virtual int getPositionForRow(int rowNumber);
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};
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//==============================================================================
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/**
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A list of items that can be scrolled vertically.
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To create a list, you'll need to create a subclass of ListBoxModel. This can
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either paint each row of the list and respond to events via callbacks, or for
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more specialised tasks, it can supply a custom component to fill each row.
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@see ComboBox, TableListBox
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@tags{GUI}
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*/
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class JUCE_API ListBox : public Component, public SettableTooltipClient {
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public:
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//==============================================================================
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/** Creates a ListBox.
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The model pointer passed-in can be null, in which case you can set it later
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with setModel().
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*/
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ListBox(const String& componentName = String(), ListBoxModel* model = nullptr);
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/** Destructor. */
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~ListBox() override;
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//==============================================================================
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/** Changes the current data model to display. */
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void setModel(ListBoxModel* newModel);
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/** Returns the current list model. */
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ListBoxModel* getModel() const noexcept { return model; }
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//==============================================================================
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/** Causes the list to refresh its content.
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Call this when the number of rows in the list changes, or if you want it
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to call refreshComponentForRow() on all the row components.
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This must only be called from the main message thread.
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*/
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void updateContent();
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//==============================================================================
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/** Turns on multiple-selection of rows.
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By default this is disabled.
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When your row component gets clicked you'll need to call the
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selectRowsBasedOnModifierKeys() method to tell the list that it's been
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clicked and to get it to do the appropriate selection based on whether
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the ctrl/shift keys are held down.
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*/
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void setMultipleSelectionEnabled(bool shouldBeEnabled) noexcept;
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/** If enabled, this makes the listbox flip the selection status of
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each row that the user clicks, without affecting other selected rows.
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(This only has an effect if multiple selection is also enabled).
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If not enabled, you can still get the same row-flipping behaviour by holding
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down CMD or CTRL when clicking.
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*/
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void setClickingTogglesRowSelection(bool flipRowSelection) noexcept;
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/** Sets whether a row should be selected when the mouse is pressed or released.
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By default this is true, but you may want to turn it off.
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*/
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void setRowSelectedOnMouseDown(bool isSelectedOnMouseDown) noexcept;
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/** Makes the list react to mouse moves by selecting the row that the mouse if over.
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This function is here primarily for the ComboBox class to use, but might be
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useful for some other purpose too.
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*/
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void setMouseMoveSelectsRows(bool shouldSelect);
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//==============================================================================
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/** Selects a row.
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If the row is already selected, this won't do anything.
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@param rowNumber the row to select
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@param dontScrollToShowThisRow if true, the list's position won't change; if false and
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the selected row is off-screen, it'll scroll to make
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sure that row is on-screen
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@param deselectOthersFirst if true and there are multiple selections, these will
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first be deselected before this item is selected
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@see isRowSelected, selectRowsBasedOnModifierKeys, flipRowSelection, deselectRow,
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deselectAllRows, selectRangeOfRows
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*/
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void selectRow(int rowNumber, bool dontScrollToShowThisRow = false, bool deselectOthersFirst = true);
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/** Selects a set of rows.
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This will add these rows to the current selection, so you might need to
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clear the current selection first with deselectAllRows()
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@param firstRow the first row to select (inclusive)
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@param lastRow the last row to select (inclusive)
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@param dontScrollToShowThisRange if true, the list's position won't change; if false and
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the selected range is off-screen, it'll scroll to make
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sure that the range of rows is on-screen
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*/
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void selectRangeOfRows(int firstRow, int lastRow, bool dontScrollToShowThisRange = false);
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/** Deselects a row.
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If it's not currently selected, this will do nothing.
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@see selectRow, deselectAllRows
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*/
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void deselectRow(int rowNumber);
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/** Deselects any currently selected rows.
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@see deselectRow
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*/
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void deselectAllRows();
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/** Selects or deselects a row.
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If the row's currently selected, this deselects it, and vice-versa.
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*/
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void flipRowSelection(int rowNumber);
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/** Returns a sparse set indicating the rows that are currently selected.
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@see setSelectedRows
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*/
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SparseSet<int> getSelectedRows() const;
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/** Sets the rows that should be selected, based on an explicit set of ranges.
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If sendNotificationEventToModel is true, the ListBoxModel::selectedRowsChanged()
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method will be called. If it's false, no notification will be sent to the model.
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@see getSelectedRows
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*/
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void setSelectedRows(const SparseSet<int>& setOfRowsToBeSelected, NotificationType sendNotificationEventToModel = sendNotification);
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/** Checks whether a row is selected.
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*/
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bool isRowSelected(int rowNumber) const;
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/** Returns the number of rows that are currently selected.
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@see getSelectedRow, isRowSelected, getLastRowSelected
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*/
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int getNumSelectedRows() const;
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/** Returns the row number of a selected row.
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This will return the row number of the Nth selected row. The row numbers returned will
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be sorted in order from low to high.
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@param index the index of the selected row to return, (from 0 to getNumSelectedRows() - 1)
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@returns the row number, or -1 if the index was out of range or if there aren't any rows
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selected
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@see getNumSelectedRows, isRowSelected, getLastRowSelected
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*/
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int getSelectedRow(int index = 0) const;
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/** Returns the last row that the user selected.
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This isn't the same as the highest row number that is currently selected - if the user
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had multiply-selected rows 10, 5 and then 6 in that order, this would return 6.
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If nothing is selected, it will return -1.
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*/
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int getLastRowSelected() const;
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/** Multiply-selects rows based on the modifier keys.
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If no modifier keys are down, this will select the given row and
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deselect any others.
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If the ctrl (or command on the Mac) key is down, it'll flip the
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state of the selected row.
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If the shift key is down, it'll select up to the given row from the
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last row selected.
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@see selectRow
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*/
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void selectRowsBasedOnModifierKeys(int rowThatWasClickedOn, ModifierKeys modifiers, bool isMouseUpEvent);
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//==============================================================================
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/** Scrolls the list to a particular position.
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The proportion is between 0 and 1.0, so 0 scrolls to the top of the list,
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1.0 scrolls to the bottom.
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If the total number of rows all fit onto the screen at once, then this
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method won't do anything.
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@see getVerticalPosition
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*/
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void setVerticalPosition(double newProportion);
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/** Returns the current vertical position as a proportion of the total.
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This can be used in conjunction with setVerticalPosition() to save and restore
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the list's position. It returns a value in the range 0 to 1.
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@see setVerticalPosition
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*/
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double getVerticalPosition() const;
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/** Scrolls if necessary to make sure that a particular row is visible. */
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void scrollToEnsureRowIsOnscreen(int row);
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/** Returns a reference to the vertical scrollbar. */
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ScrollBar& getVerticalScrollBar() const noexcept;
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/** Returns a reference to the horizontal scrollbar. */
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ScrollBar& getHorizontalScrollBar() const noexcept;
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/** Finds the row index that contains a given x,y position.
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The position is relative to the ListBox's top-left.
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If no row exists at this position, the method will return -1.
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@see getComponentForRowNumber
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*/
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int getRowContainingPosition(int x, int y) const noexcept;
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/**
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* Returns the height of the specified row. Returns zero if no model has
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* been set.
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*/
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int getRowHeight(int row) const;
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/** Finds a row index that would be the most suitable place to insert a new
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item for a given position.
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This is useful when the user is e.g. dragging and dropping onto the listbox,
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because it lets you easily choose the best position to insert the item that
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they drop, based on where they drop it.
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If the position is out of range, this will return -1. If the position is
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beyond the end of the list, it will return getNumRows() to indicate the end
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of the list.
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@see getComponentForRowNumber
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*/
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int getInsertionIndexForPosition(int x, int y) const noexcept;
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/** Returns the position of one of the rows, relative to the top-left of
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the listbox.
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This may be off-screen, and the range of the row number that is passed-in is
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not checked to see if it's a valid row.
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*/
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Rectangle<int> getRowPosition(int rowNumber, bool relativeToComponentTopLeft) const noexcept;
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/** Finds the row component for a given row in the list.
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The component returned will have been created using ListBoxModel::refreshComponentForRow().
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If the component for this row is off-screen or if the row is out-of-range,
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this will return nullptr.
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@see getRowContainingPosition
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*/
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Component* getComponentForRowNumber(int rowNumber) const noexcept;
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/** Returns the row number that the given component represents.
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If the component isn't one of the list's rows, this will return -1.
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*/
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int getRowNumberOfComponent(Component* rowComponent) const noexcept;
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/** Returns the width of a row (which may be less than the width of this component
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if there's a scrollbar).
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*/
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int getVisibleRowWidth() const noexcept;
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//==============================================================================
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/** Returns the number of rows actually visible.
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This is the number of whole rows which will fit on-screen, so the value might
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be more than the actual number of rows in the list.
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*/
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int getNumRowsOnScreen() const noexcept;
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//==============================================================================
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/** A set of colour IDs to use to change the colour of various aspects of the label.
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These constants can be used either via the Component::setColour(), or LookAndFeel::setColour()
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methods.
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@see Component::setColour, Component::findColour, LookAndFeel::setColour, LookAndFeel::findColour
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*/
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enum ColourIds {
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backgroundColourId = 0x1002800, /**< The background colour to fill the list with.
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Make this transparent if you don't want the background to be filled. */
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outlineColourId = 0x1002810, /**< An optional colour to use to draw a border around the list.
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Make this transparent to not have an outline. */
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textColourId = 0x1002820 /**< The preferred colour to use for drawing text in the listbox. */
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};
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/** Sets the thickness of a border that will be drawn around the box.
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To set the colour of the outline, use @code setColour (ListBox::outlineColourId, colourXYZ); @endcode
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@see outlineColourId
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*/
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void setOutlineThickness(int outlineThickness);
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/** Returns the thickness of outline that will be drawn around the listbox.
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@see setOutlineColour
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*/
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int getOutlineThickness() const noexcept { return outlineThickness; }
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/** Sets a component that the list should use as a header.
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This will position the given component at the top of the list, maintaining the
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height of the component passed-in, but rescaling it horizontally to match the
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width of the items in the listbox.
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The component will be deleted when setHeaderComponent() is called with a
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different component, or when the listbox is deleted.
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*/
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void setHeaderComponent(std::unique_ptr<Component> newHeaderComponent);
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/** Returns whatever header component was set with setHeaderComponent(). */
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Component* getHeaderComponent() const noexcept { return headerComponent.get(); }
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/** Changes the width of the rows in the list.
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This can be used to make the list's row components wider than the list itself - the
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width of the rows will be either the width of the list or this value, whichever is
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greater, and if the rows become wider than the list, a horizontal scrollbar will
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appear.
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The default value for this is 0, which means that the rows will always
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be the same width as the list.
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*/
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void setMinimumContentWidth(int newMinimumWidth);
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/** Returns the space currently available for the row items, taking into account
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borders, scrollbars, etc.
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*/
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|
int getVisibleContentWidth() const noexcept;
|
|
|
|
/** Repaints one of the rows.
|
|
|
|
This does not invoke updateContent(), it just invokes a straightforward repaint
|
|
for the area covered by this row.
|
|
*/
|
|
void repaintRow(int rowNumber) noexcept;
|
|
|
|
/** This fairly obscure method creates an image that shows the row components specified
|
|
in rows (for example, these could be the currently selected row components).
|
|
|
|
It's a handy method for doing drag-and-drop, as it can be passed to the
|
|
DragAndDropContainer for use as the drag image.
|
|
|
|
Note that it will make the row components temporarily invisible, so if you're
|
|
using custom components this could affect them if they're sensitive to that
|
|
sort of thing.
|
|
|
|
@see Component::createComponentSnapshot
|
|
*/
|
|
virtual Image createSnapshotOfRows(const SparseSet<int>& rows, int& x, int& y);
|
|
|
|
/** Returns the viewport that this ListBox uses.
|
|
|
|
You may need to use this to change parameters such as whether scrollbars
|
|
are shown, etc.
|
|
*/
|
|
Viewport* getViewport() const noexcept;
|
|
|
|
//==============================================================================
|
|
/** @internal */
|
|
bool keyPressed(const KeyPress&) override;
|
|
/** @internal */
|
|
bool keyStateChanged(bool isKeyDown) override;
|
|
/** @internal */
|
|
void paint(Graphics&) override;
|
|
/** @internal */
|
|
void paintOverChildren(Graphics&) override;
|
|
/** @internal */
|
|
void resized() override;
|
|
/** @internal */
|
|
void visibilityChanged() override;
|
|
/** @internal */
|
|
void mouseWheelMove(const MouseEvent&, const MouseWheelDetails&) override;
|
|
/** @internal */
|
|
void mouseUp(const MouseEvent&) override;
|
|
/** @internal */
|
|
void colourChanged() override;
|
|
/** @internal */
|
|
void parentHierarchyChanged() override;
|
|
/** @internal */
|
|
void startDragAndDrop(const MouseEvent&,
|
|
const SparseSet<int>& rowsToDrag,
|
|
const var& dragDescription,
|
|
bool allowDraggingToOtherWindows);
|
|
|
|
private:
|
|
//==============================================================================
|
|
JUCE_PUBLIC_IN_DLL_BUILD(class ListViewport)
|
|
JUCE_PUBLIC_IN_DLL_BUILD(class RowComponent)
|
|
friend class ListViewport;
|
|
friend class TableListBox;
|
|
ListBoxModel* model;
|
|
std::unique_ptr<ListViewport> viewport;
|
|
std::unique_ptr<Component> headerComponent;
|
|
std::unique_ptr<MouseListener> mouseMoveSelector;
|
|
SparseSet<int> selected;
|
|
int totalItems = 0, minimumRowWidth = 0;
|
|
int outlineThickness = 0;
|
|
int lastRowSelected = -1;
|
|
bool multipleSelection = false, alwaysFlipSelection = false, hasDoneInitialUpdate = false, selectOnMouseDown = true;
|
|
|
|
void selectRowInternal(int rowNumber, bool dontScrollToShowThisRow, bool deselectOthersFirst, bool isMouseClick);
|
|
int getContentHeight() const;
|
|
int getRowForPosition(int y) const;
|
|
int getPositionForRow(int row) const;
|
|
|
|
#if JUCE_CATCH_DEPRECATED_CODE_MISUSE
|
|
// This method's bool parameter has changed: see the new method signature.
|
|
JUCE_DEPRECATED(void setSelectedRows(const SparseSet<int>&, bool));
|
|
|
|
// Rows can now have different heights. See getRowHeight(int rowNumber) instead.
|
|
JUCE_DEPRECATED(void getRowHeight());
|
|
|
|
// Row height is now set by the ListBoxModel as rows can have different heights.
|
|
// Implement ListBoxModel::getRowHeight(int rowNumber).
|
|
JUCE_DEPRECATED(void setRowHeight(int));
|
|
|
|
// This method has been replaced by the more flexible method createSnapshotOfRows.
|
|
// Please call createSnapshotOfRows (getSelectedRows(), x, y) to get the same behaviour.
|
|
JUCE_DEPRECATED(virtual void createSnapshotOfSelectedRows(int&, int&)) {}
|
|
#endif
|
|
|
|
JUCE_DECLARE_NON_COPYABLE_WITH_LEAK_DETECTOR(ListBox)
|
|
};
|
|
|
|
} // namespace jc
|
|
} // namespace juce
|