165 lines
8.2 KiB
C
165 lines
8.2 KiB
C
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/*
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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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namespace juce
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{
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//==============================================================================
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/**
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As the title suggests, this is a button containing an image.
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The colour and transparency of the image can be set to vary when the
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button state changes.
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@see Button, ShapeButton, TextButton
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@tags{GUI}
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*/
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class JUCE_API ImageButton : public Button
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{
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public:
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//==============================================================================
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/** Creates an ImageButton.
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Use setImage() to specify the image to use. The colours and opacities that
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are specified here can be changed later using setImages().
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@param name the name to give the component
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*/
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explicit ImageButton (const String& name = String());
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/** Destructor. */
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~ImageButton() override;
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//==============================================================================
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/** Sets up the images to draw in various states.
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@param resizeButtonNowToFitThisImage if true, the button will be immediately
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resized to the same dimensions as the normal image
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@param rescaleImagesWhenButtonSizeChanges if true, the image will be rescaled to fit the
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button when the button's size changes
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@param preserveImageProportions if true then any rescaling of the image to fit
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the button will keep the image's x and y proportions
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correct - i.e. it won't distort its shape, although
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this might create gaps around the edges
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@param normalImage the image to use when the button is in its normal state.
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button no longer needs it.
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@param imageOpacityWhenNormal the opacity to use when drawing the normal image.
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@param overlayColourWhenNormal an overlay colour to use to fill the alpha channel of the
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normal image - if this colour is transparent, no overlay
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will be drawn. The overlay will be drawn over the top of the
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image, so you can basically add a solid or semi-transparent
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colour to the image to brighten or darken it
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@param overImage the image to use when the mouse is over the button. If
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you want to use the same image as was set in the normalImage
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parameter, this value can be a null image.
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@param imageOpacityWhenOver the opacity to use when drawing the image when the mouse
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is over the button
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@param overlayColourWhenOver an overlay colour to use to fill the alpha channel of the
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image when the mouse is over - if this colour is transparent,
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no overlay will be drawn
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@param downImage an image to use when the button is pressed down. If set
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to a null image, the 'over' image will be drawn instead (or the
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normal image if there isn't an 'over' image either).
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@param imageOpacityWhenDown the opacity to use when drawing the image when the button
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is pressed
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@param overlayColourWhenDown an overlay colour to use to fill the alpha channel of the
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image when the button is pressed down - if this colour is
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transparent, no overlay will be drawn
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@param hitTestAlphaThreshold if set to zero, the mouse is considered to be over the button
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whenever it's inside the button's bounding rectangle. If
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set to values higher than 0, the mouse will only be
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considered to be over the image when the value of the
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image's alpha channel at that position is greater than
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this level.
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*/
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void setImages (bool resizeButtonNowToFitThisImage,
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bool rescaleImagesWhenButtonSizeChanges,
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bool preserveImageProportions,
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const Image& normalImage,
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float imageOpacityWhenNormal,
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Colour overlayColourWhenNormal,
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const Image& overImage,
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float imageOpacityWhenOver,
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Colour overlayColourWhenOver,
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const Image& downImage,
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float imageOpacityWhenDown,
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Colour overlayColourWhenDown,
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float hitTestAlphaThreshold = 0.0f);
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/** Returns the currently set 'normal' image. */
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Image getNormalImage() const;
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/** Returns the image that's drawn when the mouse is over the button.
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If a valid 'over' image has been set, this will return it; otherwise it'll
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just return the normal image.
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*/
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Image getOverImage() const;
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/** Returns the image that's drawn when the button is held down.
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If a valid 'down' image has been set, this will return it; otherwise it'll
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return the 'over' image or normal image, depending on what's available.
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*/
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Image getDownImage() const;
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void setHitTestAlphaThreshold(float thresh);
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float getHitTestAlphaThreshold() const;
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//==============================================================================
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/** This abstract base class is implemented by LookAndFeel classes. */
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struct JUCE_API LookAndFeelMethods
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{
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virtual ~LookAndFeelMethods() = default;
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virtual void drawImageButton (Graphics&, Image*,
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int imageX, int imageY, int imageW, int imageH,
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const Colour& overlayColour, float imageOpacity, ImageButton&) = 0;
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};
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protected:
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//==============================================================================
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/** @internal */
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bool hitTest (int x, int y) override;
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/** @internal */
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void paintButton (Graphics&, bool, bool) override;
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private:
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//==============================================================================
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bool scaleImageToFit, preserveProportions;
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uint8 alphaThreshold;
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Rectangle<int> imageBounds;
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Image normalImage, overImage, downImage;
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float normalOpacity, overOpacity, downOpacity;
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Colour normalOverlay, overOverlay, downOverlay;
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Image getCurrentImage() const;
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JUCE_DECLARE_NON_COPYABLE_WITH_LEAK_DETECTOR (ImageButton)
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};
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} // namespace juce
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