juce_ResizableBorderComponent.h

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 /*
  ==============================================================================
 
   This file is part of the JUCE library.
   Copyright (c) 2022 - Raw Material Software Limited
 
   JUCE is an open source library subject to commercial or open-source
   licensing.
 
   By using JUCE, you agree to the terms of both the JUCE 7 End-User License
   Agreement and JUCE Privacy Policy.
 
   End User License Agreement: www.juce.com/juce-7-licence
   Privacy Policy: www.juce.com/juce-privacy-policy
 
   Or: You may also use this code under the terms of the GPL v3 (see
   www.gnu.org/licenses).
 
   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
{
 
//==============================================================================
class JUCE_API  ResizableBorderComponent  : public Component
{
public:
    //==============================================================================
    ResizableBorderComponent (Component* componentToResize,
                              ComponentBoundsConstrainer* constrainer);
 
    ~ResizableBorderComponent() override;
 
 
    //==============================================================================
    void setBorderThickness (BorderSize<int> newBorderSize);
 
    BorderSize<int> getBorderThickness() const;
 
 
    //==============================================================================
    class Zone
    {
    public:
        //==============================================================================
        enum Zones
        {
            centre  = 0,
            left    = 1,
            top     = 2,
            right   = 4,
            bottom  = 8
        };
 
        //==============================================================================
        explicit Zone (int zoneFlags) noexcept;
 
        Zone() noexcept;
        Zone (const Zone&) noexcept;
        Zone& operator= (const Zone&) noexcept;
 
        bool operator== (const Zone&) const noexcept;
        bool operator!= (const Zone&) const noexcept;
 
        //==============================================================================
        static Zone fromPositionOnBorder (Rectangle<int> totalSize,
                                          BorderSize<int> border,
                                          Point<int> position);
 
        MouseCursor getMouseCursor() const noexcept;
 
        bool isDraggingWholeObject() const noexcept     { return zone == centre; }
        bool isDraggingLeftEdge() const noexcept        { return (zone & left) != 0; }
        bool isDraggingRightEdge() const noexcept       { return (zone & right) != 0; }
        bool isDraggingTopEdge() const noexcept         { return (zone & top) != 0; }
        bool isDraggingBottomEdge() const noexcept      { return (zone & bottom) != 0; }
 
        template <typename ValueType>
        Rectangle<ValueType> resizeRectangleBy (Rectangle<ValueType> original,
                                                const Point<ValueType>& distance) const noexcept
        {
            if (isDraggingWholeObject())
                return original + distance;
 
            if (isDraggingLeftEdge())   original.setLeft (jmin (original.getRight(), original.getX() + distance.x));
            if (isDraggingRightEdge())  original.setWidth (jmax (ValueType(), original.getWidth() + distance.x));
            if (isDraggingTopEdge())    original.setTop (jmin (original.getBottom(), original.getY() + distance.y));
            if (isDraggingBottomEdge()) original.setHeight (jmax (ValueType(), original.getHeight() + distance.y));
 
            return original;
        }
 
        int getZoneFlags() const noexcept               { return zone; }
 
    private:
        //==============================================================================
        int zone = centre;
    };
 
    Zone getCurrentZone() const noexcept                 { return mouseZone; }
 
protected:
    void paint (Graphics&) override;
    void mouseEnter (const MouseEvent&) override;
    void mouseMove (const MouseEvent&) override;
    void mouseDown (const MouseEvent&) override;
    void mouseDrag (const MouseEvent&) override;
    void mouseUp (const MouseEvent&) override;
    bool hitTest (int x, int y) override;
 
private:
    WeakReference<Component> component;
    ComponentBoundsConstrainer* constrainer;
    BorderSize<int> borderSize;
    Rectangle<int> originalBounds;
    Zone mouseZone;
 
    void updateMouseZone (const MouseEvent&);
 
    JUCE_DECLARE_NON_COPYABLE_WITH_LEAK_DETECTOR (ResizableBorderComponent)
};
 
} // namespace juce