1.Popup介紹
Popup是一個彈出視窗的控制元件
它的常用屬性如下所示:
- anchors.centerIn : Object,用來設定居中在誰視窗中.
- closePolicy : enumeration,設定彈出視窗的關閉策略,默認值為默認值為Popup.CloseOnEscape|Popup.CloseOnPressOutside,取值有:
- Popup.NoAutoClose : 只有在手動呼叫close()后，彈出視窗才會關閉(比如加載進度時,不XIANG)，
- Popup.CloseOnPressOutside : 當滑鼠按在彈出視窗外時，彈出視窗將關閉，
- Popup.CloseOnPressOutsideParent : 當滑鼠按在其父項之外時，彈出視窗將關閉，
- Popup.CloseOnReleaseOutside : 當滑鼠在彈出視窗外部松開按下時，彈出視窗將關閉，
- Popup.CloseOnReleaseOutsideParent : 當滑鼠在其父項松開按下時，彈出視窗將關閉，
- Popup.CloseOnEscape : 當彈出視窗具有活動焦點時，按下ESC鍵時，彈出視窗將關閉，
- dim : bool,昏暗屬性,默認為undefined,設定為false,則模態視窗彈出后的其它背景不會昏暗
- modal : bool,模態,默認為false(非模態,非阻塞呼叫,指出現該對話框時,也可以與父視窗進行互動,此時dim是無效果的)
- enter : Transition,進入彈出視窗時的影片過渡
- exit : Transition,退出彈出視窗時的影片過渡
它的信號如下所示:
- void aboutToHide(): 當彈出視窗即將隱藏時，會發出此信號，
- void aboutToShow(): 當彈出視窗即將顯示時，會發出此信號，
- void closed(): 當彈出視窗關閉時發出此信號，
- void opened(): 打開彈出視窗時發出此信號，
它的方法如下所示:
- void close(): 關閉彈出視窗，
- forceActiveFocus(reason = Qt.OtherFocusReason): 強制設定焦點
- void open() : 打開彈出視窗，
然后我們來自定義實作一個帶指標的popup彈出視窗.
2.自定義Popup
由于Popup的錨布局只有一個anchors.centerIn,假如們想讓Popup位于某個控制元件的左上方時,必須得自定義一個.
實作截圖如下所示(已上傳群里):
實作效果如下所示:
首先我們需要實作horizontalPosBase和verticalPosBase兩個屬性.來實作Popup位于目標物件的哪個方位.
- 一個是設定popup在目標物件的水平方向的位置
- 一個是popup在目標物件的垂直方向的位置.
由于我們已經知道了方位,那么指標的坐標也就可以自動計算出來了.
具體實作代碼如下所示:
// 指示器方向,根據horizontalPosBase和verticalPosBase 自動計算 enum IndicatorStyle { IndicatorLeft, IndicatorRight, IndicatorTop, IndicatorBottom } function updateIndicatorPos(indicatorStyle) { switch (indicatorStyle) { case IndicatorPopup.IndicatorLeft: indicator.x = - indicator.width*0.4; indicator.y = back.height <= myTarget.height ? (back.height)/2-indicatorLen : verticalPosBase === IndicatorPopup.TopAlign ? (myTarget.height)/2 -indicatorLen : verticalPosBase === IndicatorPopup.VerticalAlign ? (back.height)/2 -indicatorLen : back.height - (myTarget.height)/2 -indicatorLen; break; case IndicatorPopup.IndicatorRight: indicator.x = width - indicator.width*1.2; indicator.y = back.height <= myTarget.height ? (back.height)/2-indicatorLen : verticalPosBase === IndicatorPopup.TopAlign ? (myTarget.height)/2 -indicatorLen : verticalPosBase === IndicatorPopup.VerticalAlign ? (back.height)/2 -indicatorLen : back.height - (myTarget.height)/2 -indicatorLen; break; case IndicatorPopup.IndicatorTop: indicator.x = back.width <= myTarget.width ? (back.width)/2-indicatorLen : horizontalPosBase === IndicatorPopup.PosBaseToRight ? (myTarget.width)/2 -indicatorLen : horizontalPosBase === IndicatorPopup.PosBaseToHorizontal ? (back.width)/2 -indicatorLen : back.width - (myTarget.width)/2 -indicatorLen; indicator.y = - indicator.width*0.4; break; case IndicatorPopup.IndicatorBottom: indicator.x = back.width <= myTarget.width ? (back.width)/2-indicatorLen : horizontalPosBase === IndicatorPopup.PosBaseToRight ? (myTarget.width)/2 -indicatorLen : horizontalPosBase === IndicatorPopup.PosBaseToHorizontal ? (back.width)/2 -indicatorLen : back.width - (myTarget.width)/2 -indicatorLen; indicator.y = height - indicator.height*1.2; break; } console.log("indicator",indicator.x,indicator.y,indicator.width,indicator.height) } function updatePopupPos() { var indicatorStyle; switch (horizontalPosBase) { case IndicatorPopup.PosBaseToLeft: // popup位于目標水平左側 x = myTarget.x - width - targetSpacing; y = verticalPosBase === IndicatorPopup.TopAlign ? myTarget.y : verticalPosBase === IndicatorPopup.VerticalAlign ? myTarget.y + myTarget.height/2 - height/2 : myTarget.y - height + myTarget.height indicatorStyle = IndicatorPopup.IndicatorRight; break; case IndicatorPopup.PosBaseToHorizontal: // popup水平中間 x = myTarget.x + myTarget.width/2 - width/2; y = verticalPosBase === IndicatorPopup.PosBaseToTop ? myTarget.y - height - targetSpacing : verticalPosBase === IndicatorPopup.PosBaseToBottom ? myTarget.y + myTarget.height + targetSpacing : myTarget.y + myTarget.height + targetSpacing indicatorStyle = verticalPosBase === IndicatorPopup.PosBaseToTop ? IndicatorPopup.IndicatorBottom : IndicatorPopup.IndicatorTop; break; case IndicatorPopup.PosBaseToRight: // popup位于目標水平右側 x = myTarget.x + myTarget.width + targetSpacing; y = verticalPosBase === IndicatorPopup.TopAlign ? myTarget.y : verticalPosBase === IndicatorPopup.VerticalAlign ? myTarget.y + myTarget.height/2 - height/2 : myTarget.y - height + myTarget.height indicatorStyle = IndicatorPopup.IndicatorLeft console.log("PosBaseToRight",x,y,indicatorStyle); break; } back.anchors.leftMargin = indicatorStyle === IndicatorPopup.IndicatorLeft ? indicatorLen : 0 back.anchors.rightMargin = indicatorStyle === IndicatorPopup.IndicatorRight ? indicatorLen : 0 back.anchors.bottomMargin = indicatorStyle === IndicatorPopup.IndicatorBottom ? indicatorLen : 0 back.anchors.topMargin = indicatorStyle === IndicatorPopup.IndicatorTop ? indicatorLen : 0 leftPadding = indicatorStyle === IndicatorPopup.IndicatorLeft ? indicatorLen : 0 rightPadding = indicatorStyle === IndicatorPopup.IndicatorRight ? indicatorLen : 0 bottomPadding = indicatorStyle === IndicatorPopup.IndicatorBottom ? indicatorLen : 0 topPadding = indicatorStyle === IndicatorPopup.IndicatorTop ? indicatorLen : 0 console.log(x,y,indicatorStyle); updateIndicatorPos(indicatorStyle); }
比如我們想讓這個popup位于目標的左側,頂部對齊,就可以這樣寫(無需指定popup的X,Y坐標了):
Button { id: btn text: "水平左側-頂部對齊" onClicked: { popup.backgroundColor = "#12B7F5" popup.horizontalPosBase = IndicatorPopup.PosBaseToLeft popup.verticalPosBase = IndicatorPopup.TopAlign popup.indicatorOpen(btn) } } IndicatorPopup { id: popup width : 180 height: 200 modal: false focus: true parent: Overlay.overlay // Overlay.overlay表示主視窗的意思,附加到任何的item、popup中,避免當前界面不是主界面的情況,無法顯示彈出視窗 TextArea { anchors.fill: parent text: "1234567890" color: "#FFF" font.pixelSize: 14 font.family: "Microsoft Yahei" wrapMode: TextEdit.WrapAnywhere } closePolicy: Popup.CloseOnEscape | Popup.CloseOnPressOutside }
如果我們使用模態的彈出視窗,并且想設定彈出視窗外的背景色,可以設定Overlay.modal附加屬性,比如設定為談紅色:
Overlay.modal: Rectangle { color: "#aaffdbe7" }
效果如下所示:
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標籤：C++