wxWidgets Discussion Forum

Here's a GridPanel class based on a wxBitmap: gridpanel.h Sample code for initializing it: GridPanel *gp = new GridPanel(panel, 256, 256, 5); gp->SetSize(10,10, 1280,1280); wxColor black = wxColor(0,0,0); gp->SetCellColor(0,0, black); gp->SetCellColor(1,1, black); gp->SetCellColor(2,2, black); gp->S...

There are many even faster ways, but it all depends on what the end result should look like. E.g. if you only wanted colored squares without separating lines, you could use a bitmap where one pixel represents one square (of arbritrary size) and you could just scale it with a fixed factor when drawing.

Setting the background color for each cell is slowing everything down here.

Here's a solution with a custom renderer: My version with a custom drawing would still be much, much faster.

First of all: In 99% of cases a wxDialog should be used as a modal dialog, called with ShowModal() instead of Show(). Are you sure you want a non-modal one? You need to call Validate() yourself: https://docs.wxwidgets.org/trunk/overview_validator.html#overview_validator_dialogs Also, if you just wan...

Can I add empty label or any object that does not consume memory in wxGridSizer of size 256*256 If you want to set individual colors to it, no. So now you're discarding everything i said so far and try to use wxPanels again? Please explain to me why my first suggestion with demo code does not work ...

AFAIK if one makes wxWindow A child of the wxWindow B by passing B to A via the Create() method, then if B is destroyed A is too. Is this correct? Yes. if so, does this still hold true if A's Create() method fails? That can't be answered universally, it depends on how far the Create() method comes ...

Given that each Create method invokes the parent's Create method, I assume that eventually the base class will record the object's pointer for later destruction right away, and therefore if one of the Create methods in the chain fails, the object will not leak: is this correct? Not necessarily. The...

After a look into the sources, it seems that at least under Windows there's dedicated platform specific code that creates a region from a polygon without rendering it into a bitmap. So it's possible that at least under Windows a wxRegion can be both small and fast. I didn't make any performance test...

You'll need a custom wxGridCellRenderer for that. Check the "grid" sample that comes with wxWidgets and search for "MyGridCellRenderer".

Eman wrote: ↑

Mon Oct 05, 2020 9:51 pm

Thanx for help. Could I use wxGrid (tables), and hide the row and column labels?

Theoretically, yes. But i doubt this would make your life easier. Of course it all depends on what the final goal is.

hamishmb wrote: ↑

Mon Oct 05, 2020 3:55 pm

Is there a simple demo program I can compile and use like with the wxPython demo?

yes, the "minimal" sample that comes with wxWidgets. You'll just have to add a few lines to demonstrate the bug/problem.

Please try to reproduce the issue with a C++ version and wx 3.0.4 first, and then try the same with 3.1.4 or the latest version from Github.

Please also mention whether you built wxWidgets with GTK2 or GTK3.

Sorry, i wrote that without testing it, it doesn't work that way.

Eman wrote: ↑

Sun Oct 04, 2020 7:06 am

Many thanks. It is helpful
class MyCanvas inherits from wxScrolledWindow, but I do not want a scroll in my App's grid. Could I achieve that?

Just comment out the SetScrollbars() call.

e.g.: text->SetFont( text->GetFont().SetPointSize(16) ); Or you can create a completely new font and set it: https://docs.wxwidgets.org/trunk/classwx_font.html Also i have one more question, how can i display in a text an Int variable? can i use wxStaticText? Once again, multiple options here: wxStr...