[PyKDE] Canvas problems

[Boudewijn Rempt]

On Tue, 12 Dec 2000, Mark Kimsal wrote:

> 
> Eric doesn't seem to run on windows, some sort of permission problem when i hit
> the 'run' button.  Could be that I just don't know how to work it though.
> Anyways, here is my code.
> 

It's not the running that's important at the moment - if you load a Python
file, does Eric show it you? That's done with a canvas, too. When I run
your app on Linux I don't get any errors, but I don't see any output,
either.

What happens if you run the following absolutely minimal script:

import sys
from qt import *
 
    
qapp=QApplication(sys.argv)
canvas=QCanvas()
canvasView=QCanvasView(canvas)
item=QCanvasText('hello world',canvas)
item.setX(0)
item.setY(0)
item.show()
canvas.resize(100,100)
canvasView.show()

qapp.connect(qapp, SIGNAL('lastWindowClosed()'), qapp, SLOT('quit()'))
qapp.exec_loop()

Do you still get errors?


Your script didn't run - mainly because the stext item got garbage
collected/dereferenced as soon as the constructor was done, but also
because black text on a black background was a bit difficult to see.

The following shows hello world:

import sys
from qt import *
 
 
class ScrollView(QCanvasView):
 def __init__(this,canvas,parent):
  QCanvasView.__init__(this,canvas,parent,'viewport')
  this.resize(parent.size())
  this.setHScrollBarMode(QCanvasView.AlwaysOff)
  this.setVScrollBarMode(QCanvasView.AlwaysOff)
 
 
class MainWindow(QWidget):
 
    def __init__(self,parent = None,name = None,fl = 0):
        QWidget.__init__(self,parent,name,fl)
 
 
        if name == None:
            self.setName('MainWindow')
 
        self.resize(623,54)
        grid = QGridLayout(self)
        grid.setSpacing(0)
        grid.setMargin(0)
 
        self.canvas = QCanvas (self,'canvas')
        #self.canvas.setBackgroundColor(Qt.black)
        self.canvas.resize(self.size().width(),self.size().height())
        viewport = ScrollView(self.canvas,self)
        self.viewport = viewport
 
        self.stext = QCanvasText('hello world',self.canvas)
        #stext = QCanvasSprite(QCanvasPixmapArray("qt.png"),self.canvas)
        self.stext.show()
 
        grid.addWidget(self.viewport,0,0)
 
 
if __name__ == '__main__':
    a = QApplication(sys.argv)
    w = MainWindow()
 
    a.setMainWidget(w)
    w.show()
 
    a.exec_loop()