Hide a rectangular block temporarily from the main window in QML - c++

Question

I created a nested rectangular block i.e. a rectangle inside a main rectangular block in QML. Now I have to hide the inner rectangular block on some operation and once the operation is finished make it visible again. I am trying the following:
Rectangle {
id: window
width: 450
height: 550
property bool isTopToolBarAreaVisible : true
Rectangle {
id: toolBarArea
width: 1
height: parent.height
color: toolBarColor
visible : isTopToolBarAreaVisible
ToolButton {
contentItem: Text {
text: "Save as"
}
onClicked: {
...
isTopToolBarAreaVisible = false // hide the inner rectangule
window.grabToImage(function(result) {
result.saveToFile(fileName);
}, Qt.size(window.width*2,window.height*2));
isTopToolBarAreaVisible = true // show the inner rectangle again
}
}
}
}
I created a boolean isTopToolBarArea to control the visibility but it does not work. Can anyone help.

Answer 1

This seems to work. I'm hiding the Rectangle containing the ToolButton when onClicked is triggered and show it again inside the callback assigned to grabToImage(callback, targetSize). Adding the RowLayout was just to make the ToolButton horizontally centered in the Rectangle.
import QtQuick
import QtQuick.Controls
import QtQuick.Layouts
Window {
width: 640
height: 480
visible: true
title: qsTr("Hello World")
Rectangle {
id: window
anchors.fill: parent
color: "green"
Rectangle {
id: toolBarArea
width: parent.width
height: 40
color: "red"
RowLayout {
anchors.fill: parent
ToolButton {
contentItem: Text { text: "Save as" }
onClicked: {
toolBarArea.visible = false
window.grabToImage(function(result) {
result.saveToFile("test.png")
toolBarArea.visible = true
}, Qt.size(window.width * 2, window.height * 2))
}
}
}
}
}
}

Answer 2

If you're just calling your delayGrab() function inside your onClicked handler, that still won't work. You're delaying the work but not allowing the UI thread to continue running while it's waiting. If your function takes a long time, a worker thread would be preferable. But for fairly short tasks, a timer will work. The timer should look something like this:
Rectangle {
...
Rectangle {
...
ToolButton {
onClicked: {
isTopToolBarAreaVisible = false // hide the inner rectangle
myTimer.start();
}
}
Timer {
id: myTimer
interval: 10 // Adjust this as needed
onTriggered: {
window.grabToImage(function(result) {
result.saveToFile(fileName);
}, Qt.size(window.width*2,window.height*2));
isTopToolBarAreaVisible = true // show the inner rectangle again
}
}
}
}