使用Flickable顯示圖檔、自繪内容或者其他視窗控件時,需要對其内容進行放大縮小時,使用MouseArea修改Flickable的contentWidth即可,但此時縮放後的顯示位置有偏移,解決方法為移動縮放内容位置,代碼(flickView為Flickable):
MouseArea{
anchors.fill: parent
onWheel:{
if(wheel.angleDelta.y>0){
flickView.contentWidth = flickView.contentWidth*1.2
flickView.contentHeight = flickView.contentHeight*1.2
flickView.contentX = flickView.contentX+0.2*wheel.x
flickView.contentY = flickView.contentY+0.2*wheel.y
}
else{
flickView.contentWidth = flickView.contentWidth*0.8
flickView.contentX = flickView.contentX-0.2*wheel.x
flickView.contentHeight = flickView.contentHeight*0.8
flickView.contentY = flickView.contentY-0.2*wheel.y
}
}
}
效果圖:
此方法會出現縮放後contentX或contentY小于Flickable的寬高時仍繼續縮放的情況,可自定義判定,例如:
MouseArea{
anchors.fill: parent
onWheel:{
if(wheel.angleDelta.y>0){
flickView.contentWidth = flickView.contentWidth*1.2
flickView.contentHeight = flickView.contentHeight*1.2
flickView.contentX = flickView.contentX+0.2*wheel.x
flickView.contentY = flickView.contentY+0.2*wheel.y
}
else{
var newWidth = flickView.contentWidth*0.8
if(newWidth>flickView.width){//判斷縮放後的contentWidth是否會小于Flickable的width
flickView.contentWidth = newWidth
flickView.contentX = flickView.contentX-0.2*wheel.x
if(flickView.contentX<0){//如果此時内容已經到達邊界,則不繼續移動
flickView.contentX=0
}
}
var newHeight = flickView.contentHeight*0.8
if(newHeight>flickView.height){
flickView.contentHeight = newHeight
flickView.contentY = flickView.contentY-0.2*wheel.y
if(flickView.contentY<0){
flickView.contentY=0
}
}
}
}
}