Carla/source/modules/juce_gui_basics/buttons/juce_ToolbarButton.h

/*
  ==============================================================================

   This file is part of the JUCE 6 technical preview.
   Copyright (c) 2017 - ROLI Ltd.

   You may use this code under the terms of the GPL v3
   (see www.gnu.org/licenses).

   For this technical preview, this file is not subject to commercial licensing.

   JUCE IS PROVIDED "AS IS" WITHOUT ANY WARRANTY, AND ALL WARRANTIES, WHETHER
   EXPRESSED OR IMPLIED, INCLUDING MERCHANTABILITY AND FITNESS FOR PURPOSE, ARE
   DISCLAIMED.

  ==============================================================================
*/

namespace juce
{

//==============================================================================
/**
    A type of button designed to go on a toolbar.

    This simple button can have two Drawable objects specified - one for normal
    use and another one (optionally) for the button's "on" state if it's a
    toggle button.

    @see Toolbar, ToolbarItemFactory, ToolbarItemComponent, Drawable, Button

    @tags{GUI}
*/
class JUCE_API  ToolbarButton   : public ToolbarItemComponent
{
public:
    //==============================================================================
    /** Creates a ToolbarButton.

        @param itemId       the ID for this toolbar item type. This is passed through to the
                            ToolbarItemComponent constructor
        @param labelText    the text to display on the button (if the toolbar is using a style
                            that shows text labels). This is passed through to the
                            ToolbarItemComponent constructor
        @param normalImage  a drawable object that the button should use as its icon. The object
                            that is passed-in here will be kept by this object and will be
                            deleted when no longer needed or when this button is deleted.
        @param toggledOnImage  a drawable object that the button can use as its icon if the button
                            is in a toggled-on state (see the Button::getToggleState() method). If
                            nullptr is passed-in here, then the normal image will be used instead,
                            regardless of the toggle state. The object that is passed-in here will be
                            owned by this object and will be deleted when no longer needed or when
                            this button is deleted.
    */
    ToolbarButton (int itemId,
                   const String& labelText,
                   std::unique_ptr<Drawable> normalImage,
                   std::unique_ptr<Drawable> toggledOnImage);

    /** Destructor. */
    ~ToolbarButton() override;


    //==============================================================================
    /** @internal */
    bool getToolbarItemSizes (int toolbarDepth, bool isToolbarVertical, int& preferredSize,
                              int& minSize, int& maxSize) override;
    /** @internal */
    void paintButtonArea (Graphics&, int width, int height, bool isMouseOver, bool isMouseDown) override;
    /** @internal */
    void contentAreaChanged (const Rectangle<int>&) override;
    /** @internal */
    void buttonStateChanged() override;
    /** @internal */
    void resized() override;
    /** @internal */
    void enablementChanged() override;

private:
    //==============================================================================
    std::unique_ptr<Drawable> normalImage, toggledOnImage;
    Drawable* currentImage = nullptr;

    void updateDrawable();
    Drawable* getImageToUse() const;
    void setCurrentImage (Drawable*);

    JUCE_DECLARE_NON_COPYABLE_WITH_LEAK_DETECTOR (ToolbarButton)
};

} // namespace juce