I'm using a gtk.Image widget to display a picture in a gtk window. I can set the image to be displayed before I call window.main(), but after I've done that the image won't change any more. Basically:
import pygtk
pygtk.require('2.0')
import gtk
(...)
window= Window()
window.canvas= gtk.Image()
window.window.add(sprite.window.canvas)
window.canvas.show()
window.canvas.set_from_file("pic1.gif")
window.main()
window.canvas.set_from_file("pic2.gif")
pic1.gif will be displayed. Is there a proper way of changing the image (I don't care if I have to use a widget other than gtk.Image)? All I can think of is destroying the window and creating a new one.
Edit:
I realized my mistake... I called window.main() for every window and any window's destroy event called gtk.main_quit(). Had to make slight adjustments, but it works now. Even after calling window.main() :)
As Rawing hasn't yet accepted his own answer, I'll post it to get this off the top of the unanswered questions page, and to help out anyone skimming this from a search engine clickthrough by providing a comprehensive answer. (Rawing, feel free to post your answer yourself, all the same.)
In your code, you're declaring window as Window(), as opposed to gtk.Window. If you're building in one window, you should not need to do this every time. Create the window once, add what you need to it. If you need additional windows, declare them separately in this module, and call them from code (instead of from main).
Furthermore, don't name your objects with a "window." at the beginning...that just gets overly confusing. Give it a simple name, add it where you need it. Python will do the rest.
A cleaned up version of your code above would probably look like this:
window = gtk.Window()
#You may need additional arguments above, such as to make it top level.
canvas = gtk.Image()
window.add(canvas)
canvas.show()
canvas.set_from_file("pic1.gif")
Now, just change the image in an event or another "def", like this:
def ChangePicture():
canvas.set_from_file("pic2.gif")
Canvas should update the picture automatically.
Related
In order to refresh a part of the grid, i.e., when font or alignment changes, I was using the following approach:
wxRect rect1=CellToRect(TopLeft);
wxRect rect2=CellToRect(BottomRight);
wxRect r(rect1.GetTopLeft(), rect2.GetBottomRight());
RefreshRect(r);
This was refreshing only a part of the intended block and was not working correctly.
From the suggestions of intellisense I came across RefreshBlock function and it works correctly. I searched the docs and have not found any information on it. I wonder if it is not recommended to use RefreshBlock for some reason? What does RefreshBlock do, does it refresh a block (as the name suggests) or is it equivalent to Refresh?
I am using wxWidgets 3.2 on Win10.
Thanks in advance.
The function RefreshBlock() is indeed the best way to do what you want and it was only undocumented by mistake, i.e. we simply forgot to do it. I've added documentation for it only now, so it will only get included in 3.2.1, but you can still use it in your code, the function itself is available since 3.1.3.
It seems from the source code that, depending on the location of its parameters, RefreshBlock refreshes any of the following:
corner grid
frozen cols grid
frozen rows grid
main grid
Since the area I wanted to refresh was on the main grid the following approach works (the idea is similar to RefreshBlock's approach):
auto GridWnd = CellToGridWindow(TL);
wxRect rect = BlockToDeviceRect(TL, BR, GridWnd);
GetGridWindow()->RefreshRect(rect);
Now everything is refreshed correctly.
Notes:
If only RefreshRect(rect) is called, things will NOT work as expected.
Little experiment showed that BlockToDeviceRect(TL, BR) also works, therefore eliminating the need for auto GridWnd = CellToGridWindow(TL);
I need to write a function goToNthMethod(int n) to let the user jump to the nth method in the file being edited.
Ideas so far:
I imagine the ContentOutline reads its tree from some sort of IContentSource (made up) or something, if I can read from the same source, that would probably be cleaner. Does something like this exist?
Read the contents of the outline view, and maybe simulate a double click on one of the Outline view's entries. This is as far as I got before I realized I was in over my head:
IWorkbenchPage page = PlatformUI.getWorkbench().getActiveWorkbenchWindow().getActivePage();
IViewPart part = page.findView("org.eclipse.ui.views.ContentOutline");
ContentOutline outline = (ContentOutline)part;
PageBook pageBook = outline.book; // Doesn't work, book is private
Tree root = pageBook.currentPage; // Doesn't work, currentPage is private
String label = root.getLabel(); // Nothing like getLabel exists
Read the entire IDocument's contents, parse the java source code within, get the offsets in the file, and feed that to the editor.selectAndReveal method. However, parsing the java source code within is a massive task, so this approach probably won't work.
Use outline.getCurrentPage(), which is a JavaOutlinePage, but I can't seem to import that class. I'm guessing I need to pull in the entire JDT project to do that. This approach also means I'm tied to a specific language, when I want my goToNthMethod to be language agnostic.
Any ideas on how I can jump to the nth method? Thanks!
Some context: I'm integrating Dragon NaturallySpeaking with eclipse to be able to program with my voice. It's working well so far, but one tedious part is navigating around the file, which would be made easier if I could say "go to 8th method". In fact, just "go to 8th entry" to just go to the 8th row in the outline view would be sufficient. Any other ideas appreciated!
Is there an example of the resize function for dropzone.js? I don't really understand how it works, it says:
"Resize is the function that gets called to create the resize information. It gets the file as first parameter and must return an object with srcX, srcY, srcWidth and srcHeight and the same for trg*. Those values are going to be used by ctx.drawImage()."
But I don't really get how to use it. So far I'm resizing the images on server-side, but I'd like to do it client-side and I think this might help. Any other solutions using dropzone.js if not this one?
I believe the built-in resize function in dropzoneJS is what is used to create the thumbnail, not resize the photo client-side, per se. There might be some way you could leverage it by setting the thumbnail dimensions to what you want to save to the server, and overwriting the file being saved with the thumbnail, but I'd have to hack about for a spell to offer you any code suggestions for that.
I want use Gridster for my web site, but i need to add lot of widgets with "add_widget" command. I do a test and i think there is a problem with "add_widget" function : grid is more and more slow and there are memory leak.
You can see that in this video : grister problem video
However, as you can see on the video, if i add widget at beginning (not with add_widget function) there is no problem. Can you help me ? Something wrong with my code ?
Thanks in advance !
In my own experience, the main culprit was using the autogenerate_stylesheet setting. The problem is that it regenerates the css on every call to add_widget(), and this just absolutely kills browsers. Additionally, gridster has/had a bug where stylesheets get duplicated, filling the <head> with tons of duplicate style rules, making it tough on the browser(this bug was supposedly fixed, but my experience was that the fix only worked in specific scenarios, definitely not in mine).
When I used gridster, my widgets were always the same size. So, in my case, I was able to generate the stylesheet once, never needing to regenerate it.
I don't think its part of the public api, but you can just call generate_stylesheet() method once manually.
var gridster = $(".gridster ul").gridster({
autogenerate_stylesheet: false,
widget_base_dimensions: [140, 140],
//other options...
}).data('gridster');
gridster.generate_stylesheet({rows: 30; cols: 8});
//freely call gridster.add_widget(...); as many times as you like
Since you're only going to generate the stylesheet once, you need to make sure gridster will generate style rules for enough rows and columns to accommodate all your widgets, otherwise once you exceed the range, you'll experience broken layouts. Just supply an upper bound on rows and cols when calling generate_stylesheet(opts). If you don't, it seems like it defaults to whatever value your gridster instance is using for max_rows and max_cols.
The nice thing is by manually generating the stylesheet, is that you completely avoid the duplicate style bug too.
The exponential slowdown will be gone. Happy gridstering.
I know I'm a bit late on this but I had the same problem and none of the above solutions worked.
However, I found that I was generating the size and coordinates of the widgets as a string rather than an integer on the back-end.
By making sure they were integers I managed to speed things up loads.
The best way to fix it, is not to disable the autogenerated stylesheet, but to edit the fn.generate_stylesheet function in jquery.gridster.js
At the end of the function, just before these lines:
return this.add_style_tag(styles);
};
add this line:
this.remove_style_tags();
The final result would look like this:
this.remove_style_tags();
return this.add_style_tag(styles);
};
With this, each time a stylesheet is generated, the previous one is removed, so there no duplication problem!
I'm using matplotlib housed in a wxPython panel to do some heavy duty plotting. My issues comes when using native panning tool - it's appears as though matplotlib tries to constantly redraw the canvas as you drag the pan handle around. With the amount of data I'm plotting this is getting really choppy (already optimized with Collections for data etc)
In terms of performance I think it would be much preferable for the canvas to just draw once when the mouse is released at the end of a pan. I realise this will mean I have to extend the WxAgg NavigationToolbar2 class with my own, but I'm wondering if anyone has attempted something similar to this and can advise me on which functions to override?
many thanks
I've spent a lot of time making modification on the matplotlib backends, I've never done this specific change, but I can show you one line of code to comment out that will stop the dynamic updating:
I presume you are using the WxAgg backend, if this is the case, open this file: C:\Python27\Lib\site-packages\matplotlib\backends\backend_wx.py
And comment out the line indicated here:
def dynamic_update(self):
d = self._idle
self._idle = False
if d:
#self.canvas.draw() #<--- Comment out to stop the redrawing during the Pan/Zoom
self._idle = True
I tested this and it seems to nicely solve your issue. I did some quick digging and I didn't see any other functions calling this procedure so you might even be able to just change it to:
def dynamic_update(self):
pass
...Which is the same code you'll find in the base NavigationToolbar2 class
(And of course, if you're happy with this change you can do a little more work to make your own custom backend with this kind of modification. Just to make sure you don't lose the change when upgrading matplotlib)