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Android, canvas: How do I clear (delete contents of) a canvas (= bitmaps), living in a surfaceView?
...There is no such method that just update a "part of the screen" since Android OS is redrawing every pixel when updating the screen. But, when you're not clearing old drawings on your Canvas, the old drawings are still on the surface and that is probably one way to "update just a part" of the screen....
Best way to implement keyboard shortcuts in a Windows Forms application?
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You probably forgot to set the form's KeyPreview property to True. Overriding the ProcessCmdKey() method is the generic solution:
protected override bool ProcessCmdKey(ref Message msg, Keys keyData) {
if (keyData == (Keys.Control | Keys.F)) {
MessageBox.Show("What the Ctrl+F?");
return...
Naming returned columns in Pandas aggregate function? [duplicate]
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Works, but gets rid of the grouped by column since its in level 0 :(
– Mugen
Feb 5 '17 at 6:09
4
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When would you use a WeakHashMap or a WeakReference?
...s, because loading them from disk
is very expensive and you want to
avoid the possibility of having two
copies of the (potentially gigantic)
image in memory at once.
Because an image cache is supposed to
prevent us from reloading images when
we don't absolutely need to, you will
q...
How to trigger event in JavaScript?
...eady accepted and the person who wrote the question (@KoolKabin) probably didn't re-read the answers
– Dorian
Jul 16 '16 at 13:24
4
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Django REST Framework: adding additional field to ModelSerializer
... return foo.name == "bar"
class Meta:
model = Foo
fields = ('id', 'name', 'my_field')
http://www.django-rest-framework.org/api-guide/fields/#serializermethodfield
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Ignore mouse interaction on overlay image
...nd-image:url(../img/reflection.png);
background-repeat:no-repeat;
width: 195px;
pointer-events:none;
}
pointer-events attribute works pretty good and is simple.
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INSERT statement conflicted with the FOREIGN KEY constraint - SQL Server
...ck from the view to the controller, so it was always 0 (which was not a valid id, but the controller would have no way of knowing that.)
– neminem
Dec 4 '13 at 19:49
1
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How to force an entire layout View refresh?
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To strictly answer the question: Use invalidate():
public void invalidate ()
Since: API Level 1
Invalidate the whole view. If the view is visible, onDraw(Canvas) will be called at some point in the future. This must be called from a UI thread. To call from...
Git pull after forced update
I just squashed some commits with git rebase and did a git push --force (which is evil, I know).
3 Answers
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