Drag cross window

Danima

How can drag and drop to DopeArea in other window of same application?

Markkyboy

Possible duplicate: https://forum.qt.io/topic/45462/drag-and-drop-in-separate-windows ( read all comments for clarity)

check out the above link, it may give you a clue :)

Danima

Danima

@Markkyboy
I checked link and add line below to solve problem. Now dragging works between two windows but the target does not move when dragging. how can solve this problem? You might say that the target cannot be displayed outside the parent window but
It doesn't matter. I just want to see movement of the target inside the parent window.

Markkyboy

@Danima - without seeing your code, I can't say. I am also still a bit of a noob with QML.

Danima

@Markkyboy
main.qml:

import QtQuick 2.12
import QtQuick.Window 2.12
import QtQuick.Controls 2.12

Window {
    id:window1
    visible: true
    width: 300
    height: 200
    x:400
    y:400
    title: qsTr("Hello World")


    Rectangle
    {
        anchors.fill: parent
        color:dropArea.containsDrag? "green" : "gray"
        DropArea
        {
            id:dropArea
            anchors.fill: parent
        }

        Text{
            anchors.fill: parent
            text:"Window1"
            verticalAlignment: Text.AlignVCenter
            horizontalAlignment: Text.AlignHCenter
        }

    }

    Window
    {
        id:window2
        visible: true
        width: 200
        height: 100
        y:400
        x:100

        flags: Qt.FramelessWindowHint


        Page
        {
            anchors.fill: parent

            header:WindowDrager
            {
                height:24
                window:window2
            }

            contentItem: Rectangle{
                color:"yellow"
                Text{
                    anchors.fill: parent
                    text:"Window2"
                    verticalAlignment: Text.AlignVCenter
                    horizontalAlignment: Text.AlignHCenter
                }

            }
        }

    }


}

WindowDrager.qml

import QtQuick 2.0
import QtQuick.Window 2.12
import QtQuick.Controls 2.12

Rectangle
{
    id:root
    property Window window:null
    color:"green"

    Item
    {
        id:dummyItem//drag.target should be an Item, while a window is not an Item
        Drag.dragType: Drag.Automatic
        Drag.active: mouseArea.drag.active

        onXChanged:
        {
            window.x +=x;
            x=0;
        }
        onYChanged:
        {
            window.y +=y;
            y=0;
        }

    }


    MouseArea
    {
        id: mouseArea
        anchors.fill: parent
        drag.target: dummyItem
    }

    Button
    {
        height: 16
        width:16
        padding: 0
        anchors.rightMargin: 4
        anchors.right: parent.right
        anchors.verticalCenter: parent.verticalCenter
        onClicked:window.close()
        text:"X"
    }
}

I add line "Drag.dragType: Drag.Automatic" to drag work between two window but when dragging the window2 does not move. if I remove above line window2 moves and dragging not work.

Markkyboy

@Danima - I cannot make your code run.

Markkyboy

@Danima - Okay, I built the project again and now it works, provided you grab Window2 by the green bar it does drag, so I cannot see what the problem is for now.

Suggestion: scrap your current build and start again using the code you have pasted here. I don't why this should make any difference, but it is working for me. Window 2 is draggable with the code you have pasted here......weird.

Ahh, okay, I see what you mean now, the green/yellow window is not actually visibly moving when it is dragged, is this what you are getting at?

Danima

@Markkyboy

Ahh, okay, I see what you mean now, the green/yellow window is not actually visibly moving when it is dragged, is this what you are getting at?

Yes that is it

I uploaded code:
https://github.com/hoss291069/QmlWindowDrager.git

Markkyboy

@Danima - I've been playing extensively with your code but cannot get your desired result.

Have a look at 'drag and drop' examples within QtCreator, perhaps it might give a clue, particularly look at the example with red and blue tiles.

Danima

@Danima
no other idea?

GrecKo

My guess is that you would have to handle the dragging yourself.

I did a little PoC some times ago : https://gist.github.com/oKcerG/79a69de5826917123582480e85e3c317

The concept is that the draggable item creates its own temporary window when it is being "dragged".

Some work has to be done to be able to use it in production, the main point is to get a better logic for the targetWindow property, for now it justs toggle between both hardcoded window, a good solution would be to get the list of top level windows and check which one applies when the item is dropped.

Feel free to ask question about this code

Danima

@GrecKo said in Drag cross window:

targetWindow

Thank you for your suggestion.
I had implemented custom drag and drop mechanism but have a bad Weakness.
When two drop area overlaps and you drag an item over drop area that was beneath other one target drop doesn't changed in intersect zone to upper dropArea.

I unfortunately deleted that code:(

I'm trying to rewrite it and post Here.

Danima

@GrecKo
I wrote that code again and it works. Now the problem is when drag area that overlaps between two or more windows; in this case drop's result is not specified.
I uploaded code in GitHub.
https://github.com/hoss291069/Qml-Drag-Drop-Between-window.git

Danima

@Danima
I solved that problem for windows platform.
https://github.com/hoss291069/Qml-Drag-Drop-Between-window.git