android - Cocos2d-x 在光标焦点上更改 MenuItemImage

Question

在 Windows7 上使用 Cocos2d-x 3.4。

如何更改鼠标光标焦点上的“MenuItemImage”图像？ (在 Windows 上)

** 我希望 MenuItemImage 具有“鼠标悬停(悬停)效果”。 **

我知道，如何创建“不触摸”或“点击”按钮。

auto button = MenuItemImage::create(
    "button_normal.png",
    "button_pressed.png",
    [](Ref* ref){
        // do anything if clicking
});
auto menuButton = Menu::create(button, NULL);
auto winSize = Director::getInstance()->getWinSize();
menuButton->setPosition(Vec2(winSize.width / 2.0, winSize.height / 2.0));
this->addChild(menuButton);

但是这种方法并没有改变焦点上的图像。

Answer 1

创建一个 EventListenerMouse 以查找鼠标悬停事件。

//
//  MouseOverMenuItem.h
//  MouseOver
//
//  Created by Baris Atamer on 3/15/15.
//
//

#ifndef __MouseOver__MouseOverMenuItem__
#define __MouseOver__MouseOverMenuItem__

#include "cocos2d.h"

USING_NS_CC;

class MouseOverMenuItem : public MenuItemImage
{
public:

    ~MouseOverMenuItem();

    static    MouseOverMenuItem * create(const std::string &normalImage, const std::string &selectedImage, const std::string &disabledImage, const ccMenuCallback& callback);

protected:
    EventListenerMouse* mouseListener;

private:
    void onMouseMove(Event *event);
    void setMouseListener();
};

#endif /* defined(__MouseOver__MouseOverMenuItem__) */



//
//  MouseOverMenuItem.cpp
//  MouseOver
//
//  Created by Baris Atamer on 3/15/15.
//
//

#include "MouseOverMenuItem.h"

MouseOverMenuItem::~MouseOverMenuItem()
{
    _eventDispatcher->removeEventListener(mouseListener);
}

MouseOverMenuItem* MouseOverMenuItem::create(const std::string &normalImage, const std::string &selectedImage, const std::string &disabledImage, const ccMenuCallback &callback)
{
    MouseOverMenuItem *ret = new (std::nothrow) MouseOverMenuItem();

    if (ret && ret->initWithNormalImage(normalImage, selectedImage, disabledImage, callback))
    {
        ret->setMouseListener();
        ret->autorelease();
        return ret;
    }
    CC_SAFE_DELETE(ret);
    return nullptr;
}

void MouseOverMenuItem::onMouseMove(Event *event)
{
    EventMouse* e = (EventMouse*)event;
    Size visibleSize = Director::getInstance()->getVisibleSize();
    Vec2 locationInNode = convertToNodeSpace(Vec2(e->getCursorX(), e->getCursorY() + visibleSize.height ));

    Rect r = Rect(0,0, getContentSize().width, getContentSize().height);

    // Show selected image if mouse over
    r.containsPoint(locationInNode) ? selected() : unselected();
}

void MouseOverMenuItem::setMouseListener()
{
    // Create a mouse listener
    mouseListener = EventListenerMouse::create();
    mouseListener->onMouseMove = CC_CALLBACK_1(MouseOverMenuItem::onMouseMove, this);
    _eventDispatcher->addEventListenerWithSceneGraphPriority(mouseListener, this);
}

用法:

auto button = MouseOverMenuItem::create("button_normal.png", "button_pressed.png", "", [](Ref* ref){
    // do anything if clicking
    log("click!");
});

button->setPosition(Vec2(winSize.width*.5, winSize.height*.5) );

// create menu, it's an autorelease object
auto menu = Menu::create(button, NULL);
menu->setPosition(Vec2::ZERO);
this->addChild(menu, 1);