ControlExtensionTest(二)-----CCControlSlider

#include "../CCControlScene.h"

class CCControlSliderTest : public CCControlScene
{
public:
    CCControlSliderTest();
    virtual ~CCControlSliderTest();
    bool init();
    void valueChanged(CCObject *sender, CCControlEvent controlEvent);
protected:
    CCLabelTTF* m_pDisplayValueLabel;
    CONTROL_SCENE_CREATE_FUNC(CCControlSliderTest)
};

CCControlSliderTest::~CCControlSliderTest()
{
    CC_SAFE_RELEASE_NULL(m_pDisplayValueLabel);
}

bool CCControlSliderTest::init()
{
    if (CCControlScene::init())
    {
        CCSize screenSize = CCDirector::sharedDirector()->getWinSize();

        // Add a label in which the slider value will be displayed
        m_pDisplayValueLabel = CCLabelTTF::create("Move the slider thumb!\nThe lower slider is restricted." ,"Marker Felt", 32);
        m_pDisplayValueLabel->retain();
        m_pDisplayValueLabel->setAnchorPoint(ccp(0.5f, -1.0f));
        m_pDisplayValueLabel->setPosition(ccp(screenSize.width / 1.7f, screenSize.height / 2.0f));
        addChild(m_pDisplayValueLabel);

        // Add the slider
//第一个参数是背景，第二个参数是进度条，第三个参数表示拖动按钮
        CCControlSlider *slider = CCControlSlider::create("extensions/sliderTrack.png","extensions/sliderProgress.png" ,"extensions/sliderThumb.png");
        slider->setAnchorPoint(ccp(0.5f, 1.0f));
        slider->setMinimumValue(0.0f); // Sets the min value of range
        slider->setMaximumValue(5.0f); // Sets the max value of range
        slider->setPosition(ccp(screenSize.width / 2.0f, screenSize.height / 2.0f + 16));
        slider->setTag(1);

        // When the value of the slider will change, the given selector will be call
//当进度值改变时，触发的函数
        slider->addTargetWithActionForControlEvents(this, cccontrol_selector(CCControlSliderTest::valueChanged), CCControlEventValueChanged);

        CCControlSlider *restrictSlider = CCControlSlider::create("extensions/sliderTrack.png","extensions/sliderProgress.png" ,"extensions/sliderThumb.png");
        restrictSlider->setAnchorPoint(ccp(0.5f, 1.0f));
        restrictSlider->setMinimumValue(0.0f); // Sets the min value of range
        restrictSlider->setMaximumValue(5.0f); // Sets the max value of range
//设置允许的最大值和最小值
        restrictSlider->setMaximumAllowedValue(4.0f);
        restrictSlider->setMinimumAllowedValue(1.5f);
        restrictSlider->setValue(3.0f);
        restrictSlider->setPosition(ccp(screenSize.width / 2.0f, screenSize.height / 2.0f - 24));
        restrictSlider->setTag(2);

    //same with restricted
        restrictSlider->addTargetWithActionForControlEvents(this, cccontrol_selector(CCControlSliderTest::valueChanged), CCControlEventValueChanged);

        addChild(slider);    
        addChild(restrictSlider);
        return true;
    }
    return false;
}

void CCControlSliderTest::valueChanged(CCObject *sender, CCControlEvent controlEvent)
{
    CCControlSlider* pSlider = (CCControlSlider*)sender;
    // Change value of label.
    if(pSlider->getTag() == 1)
        m_pDisplayValueLabel->setString(CCString::createWithFormat("Upper slider value = %.02f", pSlider->getValue())->getCString());  
    if(pSlider->getTag() == 2)
        m_pDisplayValueLabel->setString(CCString::createWithFormat("Lower slider value = %.02f", pSlider->getValue())->getCString());  
}
//pSlider->getValue()可以获取滑动条的值