JUCE/src/gui/components/layout/juce_ResizableBorderComponent.cpp

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

   This file is part of the JUCE library - "Jules' Utility Class Extensions"
   Copyright 2004-9 by Raw Material Software Ltd.

  ------------------------------------------------------------------------------

   JUCE can be redistributed and/or modified under the terms of the GNU General
   Public License (Version 2), as published by the Free Software Foundation.
   A copy of the license is included in the JUCE distribution, or can be found
   online at www.gnu.org/licenses.

   JUCE is distributed in the hope that it will be useful, but WITHOUT ANY
   WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
   A PARTICULAR PURPOSE.  See the GNU General Public License for more details.

  ------------------------------------------------------------------------------

   To release a closed-source product which uses JUCE, commercial licenses are
   available: visit www.rawmaterialsoftware.com/juce for more information.

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

#include "../../../core/juce_StandardHeader.h"

BEGIN_JUCE_NAMESPACE

#include "juce_ResizableBorderComponent.h"
#include "../juce_Desktop.h"
#include "../../graphics/geometry/juce_RectangleList.h"
#include "../../graphics/geometry/juce_Line.h"
#include "../lookandfeel/juce_LookAndFeel.h"


//==============================================================================
ResizableBorderComponent::Zone::Zone (int zoneFlags) throw()
    : zone (zoneFlags)
{
}

ResizableBorderComponent::Zone::Zone (const ResizableBorderComponent::Zone& other) throw() : zone (other.zone)    {}
ResizableBorderComponent::Zone& ResizableBorderComponent::Zone::operator= (const ResizableBorderComponent::Zone& other) throw()                   { zone = other.zone; return *this; }
bool ResizableBorderComponent::Zone::operator== (const ResizableBorderComponent::Zone& other) const throw()       { return zone == other.zone; }
bool ResizableBorderComponent::Zone::operator!= (const ResizableBorderComponent::Zone& other) const throw()       { return zone != other.zone; }

const ResizableBorderComponent::Zone ResizableBorderComponent::Zone::fromPositionOnBorder (const Rectangle<int>& totalSize,
                                                                                           const BorderSize& border,
                                                                                           const Point<int>& position)
{
    int z = 0;

    if (totalSize.contains (position)
         && ! border.subtractedFrom (totalSize).contains (position))
    {
        const int minW = jmax (totalSize.getWidth() / 10, jmin (10, totalSize.getWidth() / 3));
        if (position.getX() < jmax (border.getLeft(), minW))
            z |= left;
        else if (position.getX() >= totalSize.getWidth() - jmax (border.getRight(), minW))
            z |= right;

        const int minH = jmax (totalSize.getHeight() / 10, jmin (10, totalSize.getHeight() / 3));
        if (position.getY() < jmax (border.getTop(), minH))
            z |= top;
        else if (position.getY() >= totalSize.getHeight() - jmax (border.getBottom(), minH))
            z |= bottom;
    }

    return Zone (z);
}

const MouseCursor ResizableBorderComponent::Zone::getMouseCursor() const throw()
{
    MouseCursor::StandardCursorType mc = MouseCursor::NormalCursor;

    switch (zone)
    {
        case (left | top):      mc = MouseCursor::TopLeftCornerResizeCursor; break;
        case top:               mc = MouseCursor::TopEdgeResizeCursor; break;
        case (right | top):     mc = MouseCursor::TopRightCornerResizeCursor; break;
        case left:              mc = MouseCursor::LeftEdgeResizeCursor; break;
        case right:             mc = MouseCursor::RightEdgeResizeCursor; break;
        case (left | bottom):   mc = MouseCursor::BottomLeftCornerResizeCursor; break;
        case bottom:            mc = MouseCursor::BottomEdgeResizeCursor; break;
        case (right | bottom):  mc = MouseCursor::BottomRightCornerResizeCursor; break;
        default:                break;
    }

    return mc;
}

const Rectangle<int> ResizableBorderComponent::Zone::resizeRectangleBy (Rectangle<int> b, const Point<int>& offset) const throw()
{
    if (isDraggingWholeObject())
        return b + offset;

    if (isDraggingLeftEdge())
        b.setLeft (b.getX() + offset.getX());

    if (isDraggingRightEdge())
        b.setWidth (jmax (0, b.getWidth() + offset.getX()));

    if (isDraggingTopEdge())
        b.setTop (b.getY() + offset.getY());

    if (isDraggingBottomEdge())
        b.setHeight (jmax (0, b.getHeight() + offset.getY()));

    return b;
}


//==============================================================================
ResizableBorderComponent::ResizableBorderComponent (Component* const componentToResize,
                                                    ComponentBoundsConstrainer* const constrainer_)
   : component (componentToResize),
     constrainer (constrainer_),
     borderSize (5),
     mouseZone (0)
{
}

ResizableBorderComponent::~ResizableBorderComponent()
{
}

//==============================================================================
void ResizableBorderComponent::paint (Graphics& g)
{
    getLookAndFeel().drawResizableFrame (g, getWidth(), getHeight(), borderSize);
}

void ResizableBorderComponent::mouseEnter (const MouseEvent& e)
{
    updateMouseZone (e);
}

void ResizableBorderComponent::mouseMove (const MouseEvent& e)
{
    updateMouseZone (e);
}

void ResizableBorderComponent::mouseDown (const MouseEvent& e)
{
    if (component == 0)
    {
        jassertfalse // You've deleted the component that this resizer was supposed to be using!
        return;
    }

    updateMouseZone (e);

    originalBounds = component->getBounds();

    if (constrainer != 0)
        constrainer->resizeStart();
}

void ResizableBorderComponent::mouseDrag (const MouseEvent& e)
{
    if (component == 0)
    {
        jassertfalse // You've deleted the component that this resizer was supposed to be using!
        return;
    }

    const Rectangle<int> bounds (mouseZone.resizeRectangleBy (originalBounds, e.getOffsetFromDragStart()));

    if (constrainer != 0)
        constrainer->setBoundsForComponent (component, bounds,
                                            mouseZone.isDraggingTopEdge(),
                                            mouseZone.isDraggingLeftEdge(),
                                            mouseZone.isDraggingBottomEdge(),
                                            mouseZone.isDraggingRightEdge());
    else
        component->setBounds (bounds);
}

void ResizableBorderComponent::mouseUp (const MouseEvent&)
{
    if (constrainer != 0)
        constrainer->resizeEnd();
}

bool ResizableBorderComponent::hitTest (int x, int y)
{
    return x < borderSize.getLeft()
            || x >= getWidth() - borderSize.getRight()
            || y < borderSize.getTop()
            || y >= getHeight() - borderSize.getBottom();
}

void ResizableBorderComponent::setBorderThickness (const BorderSize& newBorderSize)
{
    if (borderSize != newBorderSize)
    {
        borderSize = newBorderSize;
        repaint();
    }
}

const BorderSize ResizableBorderComponent::getBorderThickness() const
{
    return borderSize;
}

void ResizableBorderComponent::updateMouseZone (const MouseEvent& e)
{
    Zone newZone (Zone::fromPositionOnBorder (getLocalBounds(), borderSize, e.getPosition()));

    if (mouseZone != newZone)
    {
        mouseZone = newZone;
        setMouseCursor (newZone.getMouseCursor());
    }
}

END_JUCE_NAMESPACE