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//特别说明：只是源码进行阅读，希望能有用，我没有做总结，不过后边会陆续更改，要不然太费时间。
#include "../JuceDemoHeader.h"
//==============================================================================
/** This will be the source of our balls and can be dragged around. */
//所有的自定义控件都从component继承
class BallGeneratorComponent : public Component
{
public:
BallGeneratorComponent()
{
}
//控件的绘制
void paint (Graphics& g) override
{
Rectangle<float> area (getLocalBounds().toFloat().reduced (2.0f));
g.setColour (Colours::orange);
g.drawRoundedRectangle (area, 10.0f, 2.0f);
AttributedString s;
s.setJustification (Justification::centred);
s.setWordWrap (AttributedString::none);
s.append (L"拖动!");
s.setColour (Colours::white);
s.draw (g, area);
}
void resized() override
{
//更新拖动限制区域。
// Just set the limits of our constrainer so that we don‘t drag ourselves off the screen
constrainer.setMinimumOnscreenAmounts (getHeight(), getWidth(), getHeight(), getWidth());
}
void mouseDown (const MouseEvent& e) override
{
// Prepares our dragger to drag this Component
dragger.startDraggingComponent (this, e);
}
void mouseDrag (const MouseEvent& e) override
{
// Moves this Component according to the mouse drag event and applies our constraints to it
dragger.dragComponent (this, e, &constrainer);
}
private:
ComponentBoundsConstrainer constrainer;//创建这个变量是因为dragger需要这样一个参数，当然，可以试试null是什么效果，结果当然是拖出边框。
ComponentDragger dragger;//dragger的使用模板
e.g. @code class MyDraggableComp { ComponentDragger myDragger; void mouseDown (const MouseEvent& e) { myDragger.startDraggingComponent (this, e); } void mouseDrag (const MouseEvent& e) { myDragger.dragComponent (this, e, nullptr); } }; @endcode
//具体实现代码
ComponentDragger::ComponentDragger() {}ComponentDragger::~ComponentDragger() {}//==============================================================================void ComponentDragger::startDraggingComponent (Component* const componentToDrag, const MouseEvent& e){ jassert (componentToDrag != nullptr); jassert (e.mods.isAnyMouseButtonDown()); // The event has to be a drag event! if (componentToDrag != nullptr) mouseDownWithinTarget = e.getEventRelativeTo (componentToDrag).getMouseDownPosition(); //记录鼠标在控件中的位置}void ComponentDragger::dragComponent (Component* const componentToDrag, const MouseEvent& e, ComponentBoundsConstrainer* const constrainer){ jassert (componentToDrag != nullptr); jassert (e.mods.isAnyMouseButtonDown()); // The event has to be a drag event! if (componentToDrag != nullptr) { Rectangle<int> bounds (componentToDrag->getBounds()); // If the component is a window, multiple mouse events can get queued while it‘s in the same position, // so their coordinates become wrong after the first one moves the window, so in that case, we‘ll use // the current mouse position instead of the one that the event contains...- //其实就是改变控件的位置
if (componentToDrag->isOnDesktop()) bounds += componentToDrag->getLocalPoint (nullptr, e.source.getScreenPosition()).roundToInt() - mouseDownWithinTarget; else bounds += e.getEventRelativeTo (componentToDrag).getPosition() - mouseDownWithinTarget; if (constrainer != nullptr) constrainer->setBoundsForComponent (componentToDrag, bounds, false, false, false, false); else componentToDrag->setBounds (bounds); }}
JUCE_DECLARE_NON_COPYABLE_WITH_LEAK_DETECTOR (BallGeneratorComponent)
};
//==============================================================================
//小球组件
struct BallComponent : public Component
{
//位置、大小、颜色,移动速度，当然还可以扩展其它的属性
BallComponent (const Point<float>& pos)
: position (pos),
speed (Random::getSystemRandom().nextFloat() * 4.0f - 2.0f,
Random::getSystemRandom().nextFloat() * -6.0f - 2.0f),
colour (Colours::white)
{
setSize (20, 20);
step();
}
bool step()
{
position += speed;
speed.y += 0.1f;
//这里改变了小球的位置
setCentrePosition ((int) position.x,
(int) position.y);
//同时判断小球是否超出来范围
if (Component* parent = getParentComponent())
return isPositiveAndBelow (position.x, (float) parent->getWidth()) && position.y < (float) parent->getHeight();
return position.y < 400.0f && position.x >= -10.0f;
}
//绘制小球
void paint (Graphics& g)
{
g.setColour (colour);
g.fillEllipse (2.0f, 2.0f, getWidth() - 4.0f, getHeight() - 4.0f);
g.setColour (Colours::darkgrey);
g.drawEllipse (2.0f, 2.0f, getWidth() - 4.0f, getHeight() - 4.0f, 1.0f);
}
Point<float> position, speed;
Colour colour;
JUCE_DECLARE_NON_COPYABLE_WITH_LEAK_DETECTOR (BallComponent)
};
//==============================================================================
class AnimationDemo : public Component,
private Button::Listener,
private Timer
{
public:
AnimationDemo()
{
setOpaque (true);
setSize (620, 620);
//添加11个按扭
for (int i = 11; --i >= 0;)
{
Button* b = createButton();
componentsToAnimate.add (b);
addAndMakeVisible (b);
b->addListener (this);
}
//添加小球发生器
addAndMakeVisible (ballGenerator);
//初始位置居于父容器中部，设置大小为80,50
ballGenerator.centreWithSize (80, 50);
cycleCount = 2;
for (int i = 0; i < componentsToAnimate.size(); ++i)
componentsToAnimate.getUnchecked (i)->setBounds (getLocalBounds().reduced (250, 250));
//说明，由于这里并没有进行多线程的控制，所以这里使用getUnchecked
for (int i = 0; i < componentsToAnimate.size(); ++i)
{
const int newIndex = (i + 3) % componentsToAnimate.size();
const float angle = newIndex * 2.0f * float_Pi / componentsToAnimate.size();
const float radius = getWidth() * 0.35f;
Rectangle<int> r (getWidth() / 2 + (int) (radius * std::sin (angle)) - 50,
getHeight() / 2 + (int) (radius * std::cos (angle)) - 50,
100, 100);
//下边这个是如何动作的呢？这个地方东西有点多，留到下边文章分析，大体也就是从什么地方移动什么地方，同时改变属性
animator.animateComponent (componentsToAnimate.getUnchecked(i),
r.reduced (10),
1.0f,
500 + i * 100,
false,
0.0,
0.0);
}
startTimerHz (60);
}
//填充背景颜色
void paint (Graphics& g) override
{
fillTiledBackground (g);
}
private:
OwnedArray<Component> componentsToAnimate;
OwnedArray<BallComponent> balls;
BallGeneratorComponent ballGenerator;
ComponentAnimator animator;
int cycleCount;
Button* createRandomButton()
{
DrawablePath normal, over;
Path star1;
star1.addStar (Point<float>(), 5, 20.0f, 50.0f, 0.2f);
normal.setPath (star1);
normal.setFill (Colours::red);
Path star2;
star2.addStar (Point<float>(), 7, 30.0f, 50.0f, 0.0f);
over.setPath (star2);
over.setFill (Colours::pink);
over.setStrokeFill (Colours::black);
over.setStrokeThickness (5.0f);
//BinaryData这个应当是使用juce提供的工具生成的，具体我也没试过。
Image juceIcon = ImageCache::getFromMemory (BinaryData::juce_icon_png,
BinaryData::juce_icon_pngSize);
DrawableImage down;
down.setImage (juceIcon);
down.setOverlayColour (Colours::black.withAlpha (0.3f));
if (Random::getSystemRandom().nextInt (10) > 2)
{
int type = Random::getSystemRandom().nextInt (3);
DrawableButton* d = new DrawableButton ("Button",
type == 0 ? DrawableButton::ImageOnButtonBackground
: (type == 1 ? DrawableButton::ImageFitted
: DrawableButton::ImageAboveTextLabel));
d->setImages (&normal,
Random::getSystemRandom().nextBool() ? &over : nullptr,
Random::getSystemRandom().nextBool() ? &down : nullptr);
if (Random::getSystemRandom().nextBool())
{
d->setColour (DrawableButton::backgroundColourId, getRandomBrightColour());
d->setColour (DrawableButton::backgroundOnColourId, getRandomBrightColour());
}
d->setClickingTogglesState (Random::getSystemRandom().nextBool());
return d;
}
ImageButton* b = new ImageButton ("ImageButton");
b->setImages (true, true, true,
juceIcon, 0.7f, Colours::transparentBlack,
juceIcon, 1.0f, getRandomDarkColour().withAlpha (0.2f),
juceIcon, 1.0f, getRandomBrightColour().withAlpha (0.8f),
0.5f);
return b;
}
Button* createButton()
{
Image juceIcon = ImageCache::getFromMemory (BinaryData::juce_icon_png,
BinaryData::juce_icon_pngSize);
ImageButton* b = new ImageButton ("ImageButton");
b->setImages (true, true, true,
juceIcon, 1.0f, Colours::transparentBlack,
juceIcon, 1.0f, Colours::white,
juceIcon, 1.0f, Colours::white,
0.5f);
return b;
}
void buttonClicked (Button*) override
{
//如果是点击的话，那么重新移动
for (int i = 0; i < componentsToAnimate.size(); ++i)
{
const int newIndex = (i + 3 * cycleCount) % componentsToAnimate.size();
const float angle = newIndex * 2.0f * float_Pi / componentsToAnimate.size();
const float radius = getWidth() * 0.35f;
Rectangle<int> r (getWidth() / 2 + (int) (radius * std::sin (angle)) - 50,
getHeight() / 2 + (int) (radius * std::cos (angle)) - 50,
100, 100);
animator.animateComponent (componentsToAnimate.getUnchecked(i),
r.reduced (10),
1.0f,
900 + (int) (300 * std::sin (angle)),
false,
0.0,
0.0);
}
++cycleCount;
}
void timerCallback() override
{
//此这个方移动小球的位置
// Go through each of our balls and update their position
for (int i = balls.size(); --i >= 0;)
if (! balls.getUnchecked(i)->step())
balls.remove (i);
// Randomly generate new balls
if (Random::getSystemRandom().nextInt (100) < 4)
{
BallComponent* ball = new BallComponent (ballGenerator.getBounds().getCentre().toFloat());
addAndMakeVisible (ball);
balls.add (ball);
}
}
JUCE_DECLARE_NON_COPYABLE_WITH_LEAK_DETECTOR (AnimationDemo)
};
// This static object will register this demo type in a global list of demos..
static JuceDemoType<AnimationDemo> demo (L"10 动画演示");
juce动画演示分析
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原文地址：http://www.cnblogs.com/crax/p/4197361.html
