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Restrict backdrop movement to titlebar only #3019

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Restrict backdrop movement to titlebar only #3019

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Initial plan
Copilot Feb 27, 2026
fa77bfe
Restrict backdrop movement to titlebar only
Copilot Feb 27, 2026
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42 changes: 27 additions & 15 deletions meshroom/ui/qml/GraphEditor/Backdrop.qml
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Original file line number Diff line number Diff line change
Expand Up @@ -30,7 +30,7 @@ Item {
property var childrenIndices: []

property bool ctrlHeld: false
property bool dragging: mouseArea.drag.active
property bool dragging: headerMouseArea.drag.active
property bool resizing: leftDragger.drag.active || topDragger.drag.active
// Combined x and y
property point position: Qt.point(x, y)
Expand Down Expand Up @@ -149,24 +149,12 @@ Item {
id: mouseArea
width: root.width
height: root.height
drag.target: ctrlHeld ? undefined : root
// Small drag threshold to avoid moving the node by mistake
drag.threshold: 2
acceptedButtons: Qt.NoButton
hoverEnabled: true
acceptedButtons: Qt.LeftButton | Qt.RightButton
onPressed: (mouse) => root.pressed(mouse)
onReleased: (mouse) => root.released(mouse)
onClicked: (mouse) => root.clicked(mouse)
onDoubleClicked: (mouse) => root.doubleClicked(mouse)
onEntered: root.entered()
onExited: root.exited()
drag.onActiveChanged: {
if (!drag.active) {
root.moved(Qt.point(root.x, root.y))
}
}

cursorShape: drag.active ? Qt.ClosedHandCursor : Qt.ArrowCursor
cursorShape: Qt.ArrowCursor

// --- Backdrop Resize Controls
// Resize: diagonal bottom-right
Expand Down Expand Up @@ -466,6 +454,30 @@ Item {
font.pointSize: 8
}
}

// Header-only MouseArea: handles drag, click, and selection.
// Only the titlebar allows moving the backdrop to preserve standard
// rectangle selection behavior on the backdrop body.
MouseArea {
id: headerMouseArea
anchors.fill: parent
drag.target: ctrlHeld ? undefined : root
// Small drag threshold to avoid moving the node by mistake
drag.threshold: 2
hoverEnabled: true
acceptedButtons: Qt.LeftButton | Qt.RightButton
onPressed: (mouse) => root.pressed(mouse)
onReleased: (mouse) => root.released(mouse)
onClicked: (mouse) => root.clicked(mouse)
onDoubleClicked: (mouse) => root.doubleClicked(mouse)
drag.onActiveChanged: {
if (!drag.active) {
root.moved(Qt.point(root.x, root.y))
}
}

cursorShape: drag.active ? Qt.ClosedHandCursor : Qt.OpenHandCursor
}
}

// Vertical Spacer
Expand Down