CODEWITHSUNDEEP
visual-c++mfcdialogtreecontrol
ViH
ViH

Reputation: 447

MFC — spread a control to left, right and bottom

There is a CTreeCtrl in an arbitrary position on a fixed size CDialog. Could you please advice how to position this CTreeCtrl in OnInitDialog so that its left, right and bottom sides were touched to the dialog sides, and there was an indent N on top? I've been experimenting for several hours now, but it doesn't stick correctly to right and bottom:

CRect rect;
GetWindowRect(&rect);
rect.top = N;
m_Tree.MoveWindow(&rect);

I also tried GetClientRect.

I need to get the following:

enter image description here

Upvotes: 2

Views: 607

Answers (1)

Andrew Truckle
Andrew Truckle

Reputation: 19107

By far the easiest solution in this case it to just use the inbuilt Dynamic Layout functionality:

enter image description here

  • Select the control in the IDE.
  • Set the Sizing Type property to Both.
  • Set Sizing X and Sizing Y to 100.

Then, as long as your dialog Border property is set to Resizing the tree control will stretch as you wanted:

enter image description here

No coding required as you can see:

enter image description here

Much easier!

Manual Method

But, if you do things manually you need to be sure that you understand what type of coordinates the API calls provide you. Coordinates can be relative:

  • Screen Coordinates
  • Client Coordinates

For example:

The dimensions are given in screen coordinates relative to the upper-left corner of the display screen. The dimensions of the caption, border, and scroll bars, if present, are included.

The client coordinates specify the upper-left and lower-right corners of the client area. Since client coordinates are relative to the upper-left corners of the CWnd client area, the coordinates of the upper-left corner are (0,0).

For a top-level CWnd object, the x and y parameters are relative to the upper-left corner of the screen. For a child CWnd object, they are relative to the upper-left corner of the parent window's client area.

Your tree control is a child so when you move it, the coordinates need to be relative to the upper-left corner of the parent window's client area.

Note, there is a handy CWnd::ScreenToClient API to translate from one system to the other. But this is not required in this instance.

Manual Method — Example

Putting it all together:

CRect rct;
GetClientRect(&rct);     // The client area of your window (in client coordinates)
rct.top += N;            // Adjust the top margin as required
myTree.MoveWindow(&rct); // Now move the child control

Please note that I have not debugged this to verify the code but it conveys the ideas.

Where possible I use the built in dynamic resizing, althought it can be very tricky to work out the sizing values. But in your case it is simple - 100.

I should point out that the above code will manually get it to the right place. But then you have to resize it as the window resizes. Try the Dynamic Layout approach instead.

Upvotes: 2

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