DragItemAround
==============

* :download:`Download example <PyObjCExample-DragItemAround.zip>`

Port to python of the DragItemAround example at ADC.


.. rst-class:: tabber

Sources
-------

.. rst-class:: tabbertab

DragItemAround.py
.................

.. sourcecode:: python

    # Updated by mvl on 2009-02-22 for PyObjC 2
    
    import Cocoa
    import objc
    from objc import super
    from PyObjCTools import AppHelper
    
    
    class DraggableItemView(Cocoa.NSView):
        """."""
    
        _locationDefault = Cocoa.NSMakePoint(0.0, 0.0)
        _itemColorDefault = Cocoa.NSColor.redColor()
        _backgroundColorDefault = Cocoa.NSColor.whiteColor()
    
        def awakeFromNib(self):
            self.dragging = None
    
        def initWithFrame_(self, frame):
            """."""
            result = super(DraggableItemView, self).initWithFrame_(frame)
            if result is not None:
                result._location = self._locationDefault
                result._itemColor = self._itemColorDefault
                result._backgroundColor = self._backgroundColorDefault
            return result
    
        def drawRect_(self, rect):
            """."""
            Cocoa.NSColor.whiteColor().set()
            Cocoa.NSBezierPath.fillRect_(rect)
            self.itemColor().set()
            Cocoa.NSBezierPath.fillRect_(self.calculatedItemBounds())
    
        def isOpaque(self):
            """."""
            return self.backgroundColor().alphaComponent() >= 1.0
    
        def offsetLocationByX_andY_(self, x, y):
            """."""
            self.setNeedsDisplayInRect_(self.calculatedItemBounds())
            if self.isFlipped():
                invertDeltaY = -1
            else:
                invertDeltaY = 1
            self.location().x = self.location().x + x
            self.location().y = self.location().y + y * invertDeltaY
            self.setNeedsDisplayInRect_(self.calculatedItemBounds())
    
        def mouseDown_(self, event):
            """."""
            clickLocation = self.convertPoint_fromView_(event.locationInWindow(), None)
            itemHit = self.isPointInItem_(clickLocation)
            if itemHit:
                self.dragging = True
                self.lastDragLocation = clickLocation
                Cocoa.NSCursor.closedHandCursor().push()
    
        def mouseDragged_(self, event):
            """."""
            if self.dragging:
                newDragLocation = self.convertPoint_fromView_(
                    event.locationInWindow(), None
                )
                self.offsetLocationByX_andY_(
                    newDragLocation.x - self.lastDragLocation.x,
                    newDragLocation.y - self.lastDragLocation.y,
                )
                self.lastDragLocation = newDragLocation
                self.autoscroll_(event)
    
        def mouseUp_(self, event):
            """."""
            self.dragging = False
            Cocoa.NSCursor.pop()
            self.window().invalidateCursorRectsForView_(self)
    
        def acceptsFirstResponder(self):
            """."""
            return True
    
        def keyDown_(self, event):
            """."""
            handled = False
            characters = event.charactersIgnoringModifiers()
            if characters.isEqual_("r"):
                handled = True
                self.setItemPropertiesToDefault_(self)
            if handled is False:
                super(DraggableItemView, self).keyDown_(event)
    
        @objc.IBAction
        def changeColor_(self, sender):
            """."""
            self.setItemColor_(sender.color())
    
        def resetCursorRects(self):
            """."""
            self.discardCursorRects()
            self.addCursorRect_cursor_(
                self.calculatedItemBounds(), Cocoa.NSCursor.openHandCursor()
            )
    
        @objc.IBAction
        def moveUp_(self, sender):
            """."""
            self.offsetLocationByX_andY_(0.0, 10.0)
            self.window().invalidateCursorRectsForView_(self)
    
        @objc.IBAction
        def moveDown_(self, sender):
            """."""
            self.offsetLocationByX_andY_(0.0, -10.0)
            self.window().invalidateCursorRectsForView_(self)
    
        @objc.IBAction
        def moveLeft_(self, sender):
            """."""
            self.offsetLocationByX_andY_(-10.0, 0.0)
            self.window().invalidateCursorRectsForView_(self)
    
        @objc.IBAction
        def moveRight_(self, sender):
            """."""
            self.offsetLocationByX_andY_(10.0, 0.0)
            self.window().invalidateCursorRectsForView_(self)
    
        @objc.IBAction
        def setItemPropertiesToDefault_(self, sender):
            """."""
            self.setLocation_(self._locationDefault)
            self.setItemColor_(self._itemColorDefault)
            self.setBackgroundColor_(self._backgroundColorDefault)
    
        def setLocation_(self, point):
            """."""
            if not Cocoa.NSEqualPoints(point, self.location()):
                self.setNeedsDisplayInRect_(self.calculatedItemBounds())
                self._location = point
                self.setNeedsDisplayInRect_(self.calculatedItemBounds())
                self.window().invalidateCursorRectsForView_(self)
    
        def location(self):
            """."""
            return self._location
    
        def setBackgroundColor_(self, aColor):
            """."""
            if not self.backgroundColor().isEqual_(aColor):
                self._backgroundColor = aColor
                self.setNeedsDisplayInRect_(self.calculatedItemBounds())
    
        def backgroundColor(self):
            """."""
            return self._backgroundColor
    
        def setItemColor_(self, aColor):
            """."""
            if not self.itemColor().isEqual_(aColor):
                self._itemColor = aColor
                self.setNeedsDisplayInRect_(self.calculatedItemBounds())
    
        def itemColor(self):
            """."""
            return self._itemColor
    
        def calculatedItemBounds(self):
            """."""
            return Cocoa.NSMakeRect(self.location().x, self.location().y, 60.0, 20.0)
    
        def isPointInItem_(self, testPoint):
            """."""
            itemHit = Cocoa.NSPointInRect(testPoint, self.calculatedItemBounds())
            if itemHit:
                pass
            return itemHit
    
    
    if __name__ == "__main__":
        AppHelper.runEventLoop()

.. rst-class:: tabbertab

setup.py
........

.. sourcecode:: python

    """
    Script for building the example.
    
    Usage:
        python3 setup.py py2app
    """
    from setuptools import setup
    
    setup(
        name="DragItemAround",
        app=["DragItemAround.py"],
        data_files=["MainMenu.nib"],
        setup_requires=["py2app", "pyobjc-framework-Cocoa"],
    )

