class DragWidget

** ** Copyright (C) 2004-2005 Trolltech AS. All rights reserved. ** ** This file is part of the example classes of the Qt Toolkit. ** ** This file may be used under the terms of the GNU General Public ** License version 2.0 as published by the Free Software Foundation ** and appearing in the file LICENSE.GPL included in the packaging of ** this file. Please review the following information to ensure GNU ** General Public Licensing requirements will be met: ** www.trolltech.com/products/qt/opensource.html ** ** If you are unsure which license is appropriate for your use, please ** review the following information: ** www.trolltech.com/products/qt/licensing.html or contact the ** sales department at sales@trolltech.com. ** ** This file is provided AS IS with NO WARRANTY OF ANY KIND, INCLUDING THE ** WARRANTY OF DESIGN, MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. **

** Translated to QtRuby by Richard Dale

Public Class Methods

new(parent = nil, flags = 0) click to toggle source

Calls superclass method

# File examples/draganddrop/draggableicons/dragwidget.rb, line 28
def initialize(parent = nil, flags = 0)
    super(parent, flags)
    setMinimumSize(200, 200)
    setFrameStyle(Qt::Frame::Sunken | Qt::Frame::StyledPanel)
    setAcceptDrops(true)

    boatIcon = Qt::Label.new(self)
    boatIcon.pixmap = Qt::Pixmap.new("images/boat.png")
    boatIcon.move(20, 20)
    boatIcon.show()
    boatIcon.attribute = Qt::WA_DeleteOnClose

    carIcon = Qt::Label.new(self)
    carIcon.pixmap = Qt::Pixmap.new("images/car.png")
    carIcon.move(120, 20)
    carIcon.show()
    carIcon.attribute = Qt::WA_DeleteOnClose

    houseIcon = Qt::Label.new(self)
    houseIcon.pixmap = Qt::Pixmap.new("images/house.png")
    houseIcon.move(20, 120)
    houseIcon.show()
    houseIcon.attribute = Qt::WA_DeleteOnClose
end

Public Instance Methods

dragEnterEvent(event) click to toggle source

# File examples/draganddrop/draggableicons/dragwidget.rb, line 53
def dragEnterEvent(event)
    if event.mimeData().hasFormat("application/x-dnditemdata")
        if event.source() == self
            event.dropAction = Qt::MoveAction
            event.accept()
        else
            event.acceptProposedAction()
        end
    else
        event.ignore()
    end
end

dragMoveEvent(event) click to toggle source

# File examples/draganddrop/fridgemagnets/dragwidget.rb, line 78
def dragMoveEvent(event)
    if event.mimeData().hasFormat("application/x-fridgemagnet")
        if children().include? event.source()
            event.dropAction = Qt::MoveAction
            event.accept()
        else
            event.acceptProposedAction()
        end
    elsif event.mimeData().hasText()
        event.acceptProposedAction()
    else
        event.ignore()
    end
end

dropEvent(event) click to toggle source

# File examples/draganddrop/draggableicons/dragwidget.rb, line 66
def dropEvent(event)
    if event.mimeData().hasFormat("application/x-dnditemdata")
        itemData = event.mimeData().data("application/x-dnditemdata")
        dataStream = Qt::DataStream.new(itemData, Qt::IODevice::ReadOnly.to_i)
        
        pixmap = Qt::Pixmap.new
        offset = Qt::Point.new
        dataStream >> pixmap >> offset
        newIcon = Qt::Label.new(self)
        newIcon.pixmap = pixmap
        newIcon.move(event.pos() - offset)
        newIcon.show()
        newIcon.attribute = Qt::WA_DeleteOnClose

        if event.source() == self
            event.dropAction = Qt::MoveAction
            event.accept()
        else
            event.acceptProposedAction()
        end
    else
        event.ignore()
    end
end

mousePressEvent(event) click to toggle source

# File examples/draganddrop/draggableicons/dragwidget.rb, line 91
def mousePressEvent(event)
    child = childAt(event.pos())
    if child.nil?
        return
        end

    pixmap = child.pixmap.copy

    itemData = Qt::ByteArray.new("")
    dataStream = Qt::DataStream.new(itemData, Qt::IODevice::WriteOnly.to_i)
    dataStream << pixmap << (event.pos() - child.pos())
    mimeData = Qt::MimeData.new
    mimeData.setData("application/x-dnditemdata", itemData)
        
    drag = Qt::Drag.new(self)
    drag.mimeData = mimeData
    drag.pixmap = pixmap
    drag.hotSpot = event.pos - child.pos

    tempPixmap = pixmap.copy
    painter = Qt::Painter.new
    painter.begin(tempPixmap)
    painter.fillRect(pixmap.rect(), Qt::Brush.new(Qt::Color.new(127, 127, 127, 127)))
    painter.end

    child.pixmap = tempPixmap

    if drag.start(Qt::CopyAction | Qt::MoveAction) == Qt::MoveAction
        child.close()
    else
        child.show()
        child.pixmap = pixmap
    end
end