juce/source/src/gui/components/layout/juce_ResizableEdgeComponent.cpp

   1 /*
   2   ==============================================================================
   3
   4    This file is part of the JUCE library - "Jules' Utility Class Extensions"
   5    Copyright 2004-11 by Raw Material Software Ltd.
   6
   7   ------------------------------------------------------------------------------
   8
   9    JUCE can be redistributed and/or modified under the terms of the GNU General
  10    Public License (Version 2), as published by the Free Software Foundation.
  11    A copy of the license is included in the JUCE distribution, or can be found
  12    online at www.gnu.org/licenses.
  13
  14    JUCE is distributed in the hope that it will be useful, but WITHOUT ANY
  15    WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
  16    A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
  17
  18   ------------------------------------------------------------------------------
  19
  20    To release a closed-source product which uses JUCE, commercial licenses are
  21    available: visit www.rawmaterialsoftware.com/juce for more information.
  22
  23   ==============================================================================
  24 */
  25
  26 #include "../../../core/juce_StandardHeader.h"
  27
  28 BEGIN_JUCE_NAMESPACE
  29
  30 #include "juce_ResizableEdgeComponent.h"
  31 #include "../lookandfeel/juce_LookAndFeel.h"
  32
  33
  34 //==============================================================================
  35 ResizableEdgeComponent::ResizableEdgeComponent (Component* const componentToResize,
  36                                                 ComponentBoundsConstrainer* const constrainer_,
  37                                                 Edge edge_)
  38    : component (componentToResize),
  39      constrainer (constrainer_),
  40      edge (edge_)
  41 {
  42     setRepaintsOnMouseActivity (true);
  43     setMouseCursor (MouseCursor (isVertical() ? MouseCursor::LeftRightResizeCursor
  44                                               : MouseCursor::UpDownResizeCursor));
  45 }
  46
  47 ResizableEdgeComponent::~ResizableEdgeComponent()
  48 {
  49 }
  50
  51 //==============================================================================
  52 bool ResizableEdgeComponent::isVertical() const noexcept
  53 {
  54     return edge == leftEdge || edge == rightEdge;
  55 }
  56
  57 void ResizableEdgeComponent::paint (Graphics& g)
  58 {
  59     getLookAndFeel().drawStretchableLayoutResizerBar (g, getWidth(), getHeight(), isVertical(),
  60                                                       isMouseOver(), isMouseButtonDown());
  61 }
  62
  63 void ResizableEdgeComponent::mouseDown (const MouseEvent&)
  64 {
  65     if (component == nullptr)
  66     {
  67         jassertfalse; // You've deleted the component that this resizer was supposed to be using!
  68         return;
  69     }
  70
  71     originalBounds = component->getBounds();
  72
  73     if (constrainer != nullptr)
  74         constrainer->resizeStart();
  75 }
  76
  77 void ResizableEdgeComponent::mouseDrag (const MouseEvent& e)
  78 {
  79     if (component == nullptr)
  80     {
  81         jassertfalse; // You've deleted the component that this resizer was supposed to be using!
  82         return;
  83     }
  84
  85     Rectangle<int> newBounds (originalBounds);
  86
  87     switch (edge)
  88     {
  89         case leftEdge:      newBounds.setLeft (jmin (newBounds.getRight(), newBounds.getX() + e.getDistanceFromDragStartX())); break;
  90         case rightEdge:     newBounds.setWidth (jmax (0, newBounds.getWidth() + e.getDistanceFromDragStartX())); break;
  91         case topEdge:       newBounds.setTop (jmin (newBounds.getBottom(), newBounds.getY() + e.getDistanceFromDragStartY())); break;
  92         case bottomEdge:    newBounds.setHeight (jmax (0, newBounds.getHeight() + e.getDistanceFromDragStartY())); break;
  93         default:            jassertfalse; break;
  94     }
  95
  96     if (constrainer != nullptr)
  97     {
  98         constrainer->setBoundsForComponent (component, newBounds,
  99                                             edge == topEdge,
 100                                             edge == leftEdge,
 101                                             edge == bottomEdge,
 102                                             edge == rightEdge);
 103     }
 104     else
 105     {
 106         Component::Positioner* const pos = component->getPositioner();
 107
 108         if (pos != nullptr)
 109             pos->applyNewBounds (newBounds);
 110         else
 111             component->setBounds (newBounds);
 112     }
 113 }
 114
 115 void ResizableEdgeComponent::mouseUp (const MouseEvent&)
 116 {
 117     if (constrainer != nullptr)
 118         constrainer->resizeEnd();
 119 }
 120
 121 END_JUCE_NAMESPACE