Fix binding loop in the HandwritingModeButton

The binding loop occurs when resizing the example app compiled with
disable-desktop CONFIG flag, e.g.:

<Unknown File>: QML Drag: Binding loop detected for property "maximumY"

Also, do not dynamically resize the button as the rest of the example
application is fixed size too.

Change-Id: I6f409947bd7c7697da394b61d7f732dd1dba4e49
Reviewed-by: Rainer Keller <rainer.keller@theqtcompany.com>

2 files changed, 17 insertions, 11 deletions

diff --git a/examples/quick/enterprise/virtualkeyboard/virtualkeyboard/VirtualKeyboard-b2qt.qml b/examples/quick/enterprise/virtualkeyboard/virtualkeyboard/VirtualKeyboard-b2qt.qml
index 0a469e30..cdb18b97 100644
--- a/examples/quick/enterprise/virtualkeyboard/virtualkeyboard/VirtualKeyboard-b2qt.qml
+++ b/examples/quick/enterprise/virtualkeyboard/virtualkeyboard/VirtualKeyboard-b2qt.qml
@@ -81,7 +81,7 @@ Item {
                 anchors.margins: 10
                 floating: true
                 flipable: true
-                width: handwritingInputPanel.height / 588 * 76
+                width: 76
                 height: width
                 state: handwritingInputPanel.state
                 onClicked: handwritingInputPanel.active = !handwritingInputPanel.active
diff --git a/examples/quick/enterprise/virtualkeyboard/virtualkeyboard/content/HandwritingModeButton.qml b/examples/quick/enterprise/virtualkeyboard/virtualkeyboard/content/HandwritingModeButton.qml
index cfa77c9c..c135729b 100644
--- a/examples/quick/enterprise/virtualkeyboard/virtualkeyboard/content/HandwritingModeButton.qml
+++ b/examples/quick/enterprise/virtualkeyboard/virtualkeyboard/content/HandwritingModeButton.qml
@@ -86,22 +86,28 @@ Item {
     function snapHorizontal() {
         if (!floating)
             return
-        if (mouseArea.drag.maximumX > 0 && anchors.left !== parent.left && anchors.right !== parent.right) {
-            if (x + 20 >= mouseArea.drag.maximumX)
+        if (mouseArea.drag.maximumX > mouseArea.drag.minimumX) {
+            if (x + 20 >= mouseArea.drag.maximumX) {
+                anchors.left = undefined
                 anchors.right = parent.right
-            else if (x - 20 <= mouseArea.drag.minimumX)
+            } else if (x - 20 <= mouseArea.drag.minimumX) {
+                anchors.right = undefined
                 anchors.left = parent.left
+            }
         }
     }
 
     function snapVertical() {
         if (!floating)
             return
-        if (mouseArea.drag.maximumY > 0 && anchors.bottom !== parent.bottom && anchors.top !== parent.top) {
-            if (y + 20 >= mouseArea.drag.maximumY)
+        if (mouseArea.drag.maximumY > mouseArea.drag.minimumY) {
+            if (y + 20 >= mouseArea.drag.maximumY) {
+                anchors.top = undefined
                 anchors.bottom = parent.bottom
-            else if (y - 20 <= mouseArea.drag.minimumY)
+            } else if (y - 20 <= mouseArea.drag.minimumY) {
+                anchors.bottom = undefined
                 anchors.top = parent.top
+            }
         }
     }
 
@@ -112,11 +118,11 @@ Item {
             target: handwritingModeButton.floating ? handwritingModeButton : undefined
             axis: Drag.XAxis | Drag.YAxis
             minimumX: 0
-            maximumX: Math.max(handwritingModeButton.parent.width - handwritingModeButton.width, 0)
-            onMaximumXChanged: handwritingModeButton.snapHorizontal()
+            maximumX: handwritingModeButton.parent.width - handwritingModeButton.width
+            onMaximumXChanged: !mouseArea.drag.active && handwritingModeButton.snapHorizontal()
             minimumY: 0
-            maximumY: Math.max(handwritingModeButton.parent.height - handwritingModeButton.height, 0)
-            onMaximumYChanged: handwritingModeButton.snapVertical()
+            maximumY: handwritingModeButton.parent.height - handwritingModeButton.height
+            onMaximumYChanged: !mouseArea.drag.active && handwritingModeButton.snapVertical()
         }
         onPressed: {
             if (!handwritingModeButton.floating)