I have Listbox with LBS_OWNERDRAWVARIABLE style, and trying resize items height with WM_MEASUREITEM on WM_SIZE.
I wrote code next in WM_SIZE procedure, referred http://www.codeproject.com/Articles/1401/Changing-Row-Height-in-an-owner-drawn-Control :
WINDOWPOS wp;
ZeroMemory (&wp, sizeof(WINDOWPOS));
wp.hwnd = hwndListbox;
wp.cx = iWidht;
wp.cy = iHeight;
wp.flags = SWP_NOACTIVATE | SWP_NOMOVE | SWP_NOOWNERZORDER | SWP_NOZORDER;
// WM_WINDOWPOSCHANGED for force generate WM_MEASUREITEM:
SendMessage (hwndListbox, WM_WINDOWPOSCHANGED, 0, (LPARAM)&wp);
however, It dosen't work... (dosen't generate WM_MESUREITEM.)
Question: How to force generate WM_MESUREITEM, or Resizing of items height dynamically?
p.s I using C++ with Win32, not MFC.
Use the LB_SETITEMHEIGHT message to change the height of listbox items.
Related
I'm creating my own program in WINAPI. I've got one problem.
I created a listbox with WS_VSCROLL style.
Everything is ok, but if I fill the listbox with strings the last strings are "invisible".
I must to scroll down list and then I can see the strings.
How do I automatically scroll down the listbox, using the mouse, to show the last string?
You know, I wrote chatBox. Every chatbox, which I know, has got this function:
hListaChatu = CreateWindowEx( WS_EX_DLGMODALFRAME, "LISTBOX", NULL,
WS_CHILD|WS_VISIBLE|WS_BORDER|WS_VSCROLL, rect_okna_glownego.right - 320,
rect_okna_glownego.top, 300, rect_edit_text.top - 25 , hwnd, NULL,
hInstance, NULL );
Years ago, I added an edit control to the toolbar in my application following directions similar to these:
http://www.codeproject.com/Articles/1106/Adding-a-Combo-Box-to-a-Docking-Toolbar
Similar directions can be found in many articles, so I think the procedure is fairly common. Until a few years ago, this worked fine, and the result was as shown in the article. However, I believe the move to XP changed the appearance of buttons in the toolbar, and instead I now see this in my application:
It seems as though the original instructions worked only because controls prior to the change occupied the entire height of the toolbar, so the edit control obstructed the separator behind it.
Ideally, I think the underlying separator should be made invisible. However, this doesn't seem to be handled explicitly in any of the articles I've found, and I'm not quite sure myself how to prevent the separator from being drawn.
Any help would be greatly appreciated. Thanks!
If you follow that article on codeproject exactly, you have probably modified the place holder into a separator from a button. This is why the separator line shown thru when the height of the button image is bigger than the height of the combo box.
If you keep the place holder as an empty button, you will not have such problem. A series of several place holder buttons may be needed in cascaded formation for a really useful length for the combobox.
This technique is demonstrated as follows:
// standard creation of the toolbar in CMainFrame::OnCreate
if (!m_wndToolBar.CreateEx(this, TBSTYLE_FLAT, WS_CHILD | WS_VISIBLE | CBRS_TOP
| CBRS_GRIPPER | CBRS_TOOLTIPS | CBRS_FLYBY | CBRS_SIZE_DYNAMIC) ||
!m_wndToolBar.LoadToolBar(IDR_MAINFRAME))
{
TRACE0("Failed to create toolbar\n");
return -1; // fail to create
}
// status bar creation .....
// .....
// the place holders are a series of 5 empty toolbar buttons ie: ID_COMBO_1 to ID_COMBO_5
// get index of first combobox place holder
INT nIndex = m_wndToolBar.GetToolBarCtrl().CommandToIndex(ID_COMBO_1);
// get size of first place holder rectangle
CRect rcRect;
m_wndToolBar.GetToolBarCtrl().GetItemRect(nIndex, &rcRect);
INT nWidth = rcRect.Width();
// calculate width of combobox with sum of all place holder (5 in total)
nWidth = nWidth * 5;
rcRect.top = 5; // top of combo box
rcRect.bottom = rcRect.top + 250; // drop height
rcRect.right = rcRect.left + nWidth;
// create the combobox to sit above the place holders
if(!m_comboBox.Create(CBS_DROPDOWNLIST | CBS_SORT | WS_VISIBLE |
WS_TABSTOP | WS_VSCROLL, rcRect, &m_wndToolBar, ID_COMBO_1))
{
TRACE(_T("Failed to create combo-box\n"));
return FALSE;
}
m_comboBox.AddString("Toolbar Combobox item one");
m_comboBox.AddString("Toolbar Combobox item two");
m_comboBox.AddString("Toolbar Combobox item three");
I've used this technique from CodeGuru. It's old, but, I've been using it for many years and it still works.
I want my console window to be modified. I got the handle. And this helps to change it. But how can I
remove close button
remove maximize button
remove icon
disable resizing
?
// C# syntax
StringBuilder buffer = new StringBuilder(260);
IntPtr window = FindWindow(null, buffer.ToString(0, GetConsoleTitle(buffer, buffer.Capacity)));
uint a = (uint)((WS_BORDER | WS_CAPTION) & (~WS_ICONIC));
SetWindowLongPtr(window, -16, new IntPtr(a)); // GWL_STYLE = -16
For some reason the window is broken after this call. I can't move it with the mouse anymore and all clicks go through it to other windows.
You removed all the window styles, and added back just WS_BORDER and WS_CAPTION. What you should do is:
Read the current window style with a call to GetWindowLongPtr.
Perform bitwise AND with the bitwise negation of the styles you want to remove.
Set the window style with a call to SetWindowLongPtr.
I was wondering if there is a way to add (programatically, of course) an icon/button/whatever besides plain text to a window (Microsoft Windows window...)'s title bar or next to where the minimize/maximize/close buttons are. I could draw it myself and create an illusion it is a part of the window, but I wonder if in the user32 api there is such a method.
So far, I found a way to disable the minimize/maximize/close buttons but not a way to add a custom one to them. It seems strange to me.
Here is what I am trying to achieve:
I have been wondering how it is done here, since drawing a button for every window using gdi/gdi+ and then detecting if it is overlapped by another window and then displaying only the non-overlapped part seems to me like an unlikely solution. Probably the button has been registered in the window class so that every window has this button. Any pointers what to do?
In addition, how do I create a button at all, assuming I DON'T have Unicode enabled. Then in the following piece of code:
HWND hwndCommandLink = CreateWindow(
L"BUTTON", // Class; Unicode assumed.
L"", // Text will be defined later.
WS_TABSTOP | WS_VISIBLE | WS_CHILD | BS_COMMANDLINK, // Styles.
10, // x position.
10, // y position.
100, // Button width.
100, // Button height.
hDlg, // Parent window.
NULL, // No menu.
(HINSTANCE)GetWindowLong(hDlg, GWL_HINSTANCE),
NULL); // Pointer not needed.
SendMessage(clHwnd, WM_SETTEXT, 0, (LPARAM)L"Command link");
SendMessage(clHwnd, BCM_SETNOTE, 0, (LPARAM)L"with note");
I have to substitute all the nice Windows constants with their long equivalent....However, when I search for them, all i get is this:
http://msdn.microsoft.com/en-us/library/bb775951(v=VS.85).aspx
Any pointers?
I followed this tutorial (there's a bit more than what's listed here because in my code I get a window via mouse click) for grabbing a window as a bitmap and then rendering that bitmap in a different window.
My question:
When that window is minimized or hidden (SW_HIDE) my screen capture doesn't work, so is it possible to capture a window when it is minimized or hidden?
The PrintWindow api works well, I use it for capturing thumbnails for hidden windows. Despite the name, it is different than WM_PRINT and WM_PRINTCLIENT, it works with pretty much every window except for Direct X / WPF windows.
I added some code (C#) but after reviewing how I used the code, I realized that the window isn't actually hidden when I capture its bitmap, its just off screen so this may not work for your case. Could you show the window off screen, do a print and then hide it again?
public static Bitmap PrintWindow(IntPtr hwnd)
{
RECT rc;
WinUserApi.GetWindowRect(hwnd, out rc);
Bitmap bmp = new Bitmap(rc.Width, rc.Height, PixelFormat.Format32bppArgb);
Graphics gfxBmp = Graphics.FromImage(bmp);
IntPtr hdcBitmap = gfxBmp.GetHdc();
bool succeeded = WinUserApi.PrintWindow(hwnd, hdcBitmap, 0);
gfxBmp.ReleaseHdc(hdcBitmap);
if (!succeeded)
{
gfxBmp.FillRectangle(new SolidBrush(Color.Gray), new Rectangle(Point.Empty, bmp.Size));
}
IntPtr hRgn = WinGdiApi.CreateRectRgn(0, 0, 0, 0);
WinUserApi.GetWindowRgn(hwnd, hRgn);
Region region = Region.FromHrgn(hRgn);
if (!region.IsEmpty(gfxBmp))
{
gfxBmp.ExcludeClip(region);
gfxBmp.Clear(Color.Transparent);
}
gfxBmp.Dispose();
return bmp;
}
There are WM_PRINT and WM_PRINTCLIENT messages you can send to the window, which cause its contents to be rendered into the HDC of your choice.
However, these aren't perfect: while the standard Win32 controls handle these correctly, any custom controls in the app might not.
I am trying to get the bitmap of partially hidden controls.
I used code before that did the drawing, but included windows overlapping it. So.. maybe you want to try this.
The WM_PRINTCLIENT should (in my understanding) redraw all inside the control, even if it is not really visible.
const int WM_PRINT = 0x317, WM_PRINTCLIENT = 0x318, PRF_CLIENT = 4,
PRF_CHILDREN = 0x10, PRF_NON_CLIENT = 2,
COMBINED_PRINTFLAGS = PRF_CLIENT | PRF_CHILDREN | PRF_NON_CLIENT;
SendMessage(handle, WM_PRINTCLIENT, (int)hdc, COMBINED_PRINTFLAGS);
//GDIStuff.BitBlt(hdc, 0, 0, width, height, hdcControl, 0, 0, (int)GDIStuff.TernaryRasterOperations.SRCCOPY);
The before code is commented out now. It is based on the code found here: Pocket PC: Draw control to bitmap (accepted answer). It is basically the same as Tim Robinson suggests in this thread.
Also, have a look here
http://www.tcx.be/blog/2004/paint-control-onto-graphics/