我的CCScrollView带有CCControlButtons的容器,当按钮滚出可见的CCScrollView区域时,它们也可以被触摸。我该如何控制该区域?
答案 0 :(得分:3)
受Tomasz的回答启发,我创建了一个替代解决方案,也继承自CCControlButton
:
bool ScrollableButton::isTouchInside(CCTouch *touch) {
return !dragging && CCControlButton::isTouchInside(touch);
}
bool ScrollableButton::ccTouchBegan(CCTouch *touch, CCEvent *event) {
dragging = false;
return CCControlButton::ccTouchBegan(touch, event);
}
void ScrollableButton::ccTouchMoved(CCTouch *touch, CCEvent *event) {
if (!dragging && ccpDistance(touch->getLocation(), touch->getStartLocation()) > 25) {
dragging = true;
}
CCControlButton::ccTouchMoved(touch, event);
}
void ScrollableButton::ccTouchEnded(CCTouch *touch, CCEvent *event) {
CCControlButton::ccTouchEnded(touch, event);
dragging = false;
}
void ScrollableButton::ccTouchCancelled(CCTouch *touch, CCEvent *event) {
CCControlButton::ccTouchCancelled(touch, event);
dragging = false;
}
秘密酱是isTouchInside
功能的覆盖,即使触摸在里面但被移动,它也会返回false
。这样,一旦开始滚动,该按钮也将释放其“缩放”状态。
它还增加了一个小的容差因子,因此如果触摸移动一点点,它仍然被认为是“点击”。在上面的例子中,这个因子在25处被硬编码。
答案 1 :(得分:2)
我的问题: 有一个带有许多按钮(项目)的scrollView。它上面有2个功能按钮(返回,开始)。
当我向下滚动项目按钮覆盖功能按钮时。当我吞下滚动视图上方的所有触摸时,我将丢失我的功能按钮。所以我必须找到另一种解决方案。
当我开始拖动滚动视图时,按下了一个项目按钮。当我结束时,按钮动作将被执行。这非常烦人。
但是有解决方案。我创建了新的CCControlButton。它会检查是否在scrollview外部单击或被拖动。该按钮用于项目按钮。
bool ControlButtonForScrolling::checkIfTouchIsInsideScrollView(CCTouch *pTouch)
{
CCPoint touchLocation = pTouch->getLocation(); // Get the touch position
touchLocation = _scrollView->getParent()->convertToNodeSpace(touchLocation);
CCRect bBox=_scrollView->boundingBox();
bool result = bBox.containsPoint(touchLocation);
return result;
}
bool ControlButtonForScrolling::ccTouchBegan(CCTouch *pTouch, CCEvent *pEvent)
{
bool isInside = this->checkIfTouchIsInsideScrollView(pTouch);
if (isInside) {
return CCControlButton::ccTouchBegan(pTouch, pEvent);
}
else
{
return false;
}
}
void ControlButtonForScrolling::ccTouchMoved(CCTouch *pTouch, CCEvent *pEvent)
{
CCControlButton::ccTouchMoved(pTouch, pEvent);
_scrollWasDragged = true; // information about dragging is stored to prevent sending action
}
void ControlButtonForScrolling::ccTouchEnded(CCTouch *pTouch, CCEvent *pEvent)
{
// this method is a copy of CCControlButton::ccTouchEnded except lines with _scrollWasDragged
m_eState = CCControlStateNormal;
m_isPushed = false;
setHighlighted(false);
if (!_scrollWasDragged)
{
if (isTouchInside(pTouch))
{
sendActionsForControlEvents(CCControlEventTouchUpInside);
}
else
{
sendActionsForControlEvents(CCControlEventTouchUpOutside);
}
}
_scrollWasDragged = false;
}