With this call
SystemParametersInfo(SPI_SETCLIENTAREAANIMATION, 0, (LPVOID)FALSE, 0);
I disable the animation of buttons in my Win32 C++ project (no MFC or anything else) that has Visual Styles Common Controls 6.0.0.0 enabled and correctly initialized by calling InitCommonControlsEx function. Is there an alternative method to do this? I am asking because I don't want to disable the animation for the whole system but ONLY for my application. The buttons I create are Custom Drawn (not Owner Drawn).
I create a button like this in the WM_CREATE message (hwndbutton is defined before as static so that I can share it between all WM messages):
hwndbutton = CreateWindowEx(0, L"BUTTON", L"example", WS_CHILD | WS_VISIBLE | BS_PUSHBUTTON, x, y, width, height, hwnd, (HMENU)button_id, GetModuleHandle(NULL), NULL);
and I draw it
...
case WM_NOTIFY:
{
LPNMHDR item = (LPNMHDR)lParam;
if (item->idFrom == button_id && item->code == NM_CUSTOMDRAW)
{
LPNMCUSTOMDRAW item_draw = (LPNMCUSTOMDRAW)item;
if (item_draw->uItemState & CDIS_HOT)
{
SetDCBrushColor(item_draw->hdc, RGB(180, 180, 180));
SelectObject(item_draw->hdc, GetStockObject(DC_BRUSH));
}
else
{
SetDCBrushColor(item_draw->hdc, RGB(255, 255, 255));
SelectObject(item_draw->hdc, GetStockObject(DC_BRUSH));
}
SetDCPenColor(item_draw->hdc, RGB(0, 0, 0));
SelectObject(item_draw->hdc, GetStockObject(DC_PEN));
RoundRect(item_draw->hdc, item_draw->rc.left, item_draw->rc.top, item_draw->rc.right, item_draw->rc.bottom, 0, 0);
return CDRF_DODEFAULT; // Return would be CDRF_SKIPDEFAULT but I want to keep the text "example" drawn
}
break;
...
By "button animation", I mean for example the fading effect that takes place in the button color when you move the cursor over a button and then leave it: I would like it to be colorA when normale state or colorB when mouse is over and not colorA when normal and fade_until_you_reach_colorB when mouse is over.
Thanks
EDIT: I add two gifs
The first is what I want (and I obtain with a previous call to SystemParametersInfo) and the second is the animation I would like to avoid
What I want
What I DON'T want
Theme for individual windows and controls can be disabled as follows:
SetWindowTheme(hbutton, L" ", L" ");
Animation should already be disabled because you are using custom draw. This method will also disable mouse-hover effect.
Normally when you disable a button's theme it may look weird with old 3-D borders on newer systems. You can add BS_FLAT to button's style.
This Answer is really great if you want to change the background color of a "conventional" text label. But what if you want to put a border around that text label and expand its size so that the text is swimming in a veritable sea of color? It only paints the text background in the required color, and leaves the rest of the expanded control with the standard button face. How can one make the color consistent across the entire control?
Note: The attractive feature (to me anyway) about the above answer is that it makes use of OnCtlColor(), which provides a pointer to the CWnd control concerned. So there is no need to create a subclass of CStatic to handle the color change. An answer that avoids creating such a subclass would be preferred.
I'm not very sure about OP's Note section. Still posting this code for his help.
HBRUSH CSampleDlg::OnCtlColor(CDC* pDC, CWnd *pWnd, UINT nCtlColor)
{
switch (nCtlColor)
{
case CTLCOLOR_STATIC:
{
CRect rcWindow(0, 0, 220, 40);
//::GetWindowRect(pWnd->GetSafeHwnd(), &rcWindow);
pDC->FillSolidRect(rcWindow, RGB(49, 49, 49));
pDC->SetTextColor(RGB(255, 255, 255));
return (HBRUSH)GetStockObject(NULL_BRUSH);
}
default:
{
return CDialog::OnCtlColor(pDC, pWnd, nCtlColor);
}
}
}
You can make the static control invisible in the resource editor then paint it from CMyDialog.
void CMyDialog::OnPaint()
{
CDialog::OnPaint();
paintstatic(IDC_STATIC1);
}
void CMyDialog::paintstatic(int id)
{
CClientDC dc(this);
CRect rc;
CWnd *child = GetDlgItem(id);
child->GetWindowRect(&rc);
CPoint offset(0, 0);
ClientToScreen(&offset);
rc.OffsetRect(-offset);
dc.FillSolidRect(rc, RGB(0, 255, 128));
CFont *font = GetFont();
dc.SelectObject(font);
CString text;
child->GetWindowText(text);
dc.DrawText(text, rc, DT_CENTER | DT_VCENTER | DT_SINGLELINE);
}
Hi I have WNDCLASSEX structure which has this data:
m_wndClass.cbSize = sizeof(WNDCLASSEX);
m_wndClass.style = CS_NOCLOSE;
m_wndClass.lpfnWndProc = WndProc;
m_wndClass.cbClsExtra = 0;
m_wndClass.cbWndExtra = 0;
m_wndClass.hInstance = GetModuleHandle(NULL);
m_wndClass.hIcon = NULL;
m_wndClass.hCursor = LoadCursor(NULL, IDC_ARROW);
m_wndClass.hbrBackground = NULL;
m_wndClass.lpszMenuName = NULL;
m_wndClass.lpszClassName = Checkbox::CHECKBOX_CLASS.c_str();
m_wndClass.hIconSm = NULL;
I need to have window without background, because I need to draw text on parent window and text may be any color.
Drawing works fine, code for drawing:
case WM_PAINT:
{
PAINTSTRUCT ps;
HDC dc = BeginPaint(window, &ps);
if (!classInfo->m_text.empty())
{
HDC wdc = GetDC(window);
SetBkMode(wdc,TRANSPARENT);
DrawText(wdc, classInfo->m_text.c_str(), -1, &classInfo->m_textRect, DT_CENTER | DT_VCENTER | DT_SINGLELINE | DT_NOCLIP);
ReleaseDC(window, wdc);
}
EndPaint(window, &ps);
break;
}
However I have method to change text of label:
void Checkbox::SetText(const String& text)
{
m_text = text;
SetTextRectSize(); //calculates size of RECT
if (m_window != NULL)
InvalidateRect(m_window, NULL, TRUE);
}
After I create window with label I see label, however if I want to change text on it, it doesn't change (I need to manualy resize window and it changes after that). However I hadn't have this problem at the time when I used to have colored background, for example my window class had this:
m_wndClass.hbrBackground = HBRUSH(COLOR_3DFACE+1);
I want to ask, how to update window which, has no background.
EDIT: I have tried some stuff
FillRect(dc, &rect, (HBRUSH)GetStockObject(NULL_BRUSH));
also tried to change window procedure:
case WM_CTLCOLORSTATIC:
{
HDC hdc = (HDC) wp;
SetBkMode (hdc, TRANSPARENT);
return (LRESULT)GetStockObject(NULL_BRUSH);
}
And the result is that I draw new text on previous, after setting text into some longer text part of label becomes corupted! see this but after resizing the main window my label becomes readable.
Your code doesn't set the device context's text foreground color for DrawText(), although the default is black. See SetTextColor().
SetBkMode(..., TRANSPARENT) just sets the background color/mode for the DrawText() rect, not the entire window.
You are asking about how to draw the window so it is transparent, but the problem isn't with the drawing at all.
The answer is essentially that everything you have done so far towards making a transparent window is wrong. It looks like the window is transparent, but in fact it is not, as you can see from the behaviour you describe when you move and resize the window. That's the classic symptom.
In other words, you haven't made the window transparent, you have just stopped drawing the background. What you see as the background is just whatever happened to be underneath the window when it was first drawn.
You need make a Layered window. To find out how to make transparent windows, go here:
http://msdn.microsoft.com/en-us/library/ms997507.aspx
Do you want Text/Check/Label be transparent on parent form?
You can Add WS_CLIPSIBLINGS and WS_EX_TRANSPARENT..
Use SetBkMode(hDC, TRANSPARENT) When WM_PAINT message
I am trying to make a radio button control with a transparent background using only Win32 when themes are enabled. The reason for doing this is to allow a radio button to be placed over an image and have the image show (rather than the grey default control background).
What happens out of the box is that the control will have the grey default control background and the standard method of changing this by handling either WM_CTLCOLORSTATIC or WM_CTLCOLORBTN as shown below does not work:
case WM_CTLCOLORSTATIC:
hdcStatic = (HDC)wParam;
SetTextColor(hdcStatic, RGB(0,0,0));
SetBkMode(hdcStatic,TRANSPARENT);
return (LRESULT)GetStockObject(NULL_BRUSH);
break;
My research so far indicates that Owner Draw is the only way to achieve this. I've managed to get most of the way with an Owner Draw radio button - with the code below I have a radio button and a transparent background (the background is set in WM_CTLCOLORBTN). However, the edges of the radio check are cut off using this method - I can get them back by uncommenting the call to the function DrawThemeParentBackgroundEx but this breaks the transparency.
void DrawRadioControl(HWND hwnd, HTHEME hTheme, HDC dc, bool checked, RECT rcItem)
{
if (hTheme)
{
static const int cb_size = 13;
RECT bgRect, textRect;
HFONT font = (HFONT)SendMessageW(hwnd, WM_GETFONT, 0, 0);
WCHAR *text = L"Experiment";
DWORD state = ((checked) ? RBS_CHECKEDNORMAL : RBS_UNCHECKEDNORMAL) | ((bMouseOverButton) ? RBS_HOT : 0);
GetClientRect(hwnd, &bgRect);
GetThemeBackgroundContentRect(hTheme, dc, BP_RADIOBUTTON, state, &bgRect, &textRect);
DWORD dtFlags = DT_VCENTER | DT_SINGLELINE;
if (dtFlags & DT_SINGLELINE) /* Center the checkbox / radio button to the text. */
bgRect.top = bgRect.top + (textRect.bottom - textRect.top - cb_size) / 2;
/* adjust for the check/radio marker */
bgRect.bottom = bgRect.top + cb_size;
bgRect.right = bgRect.left + cb_size;
textRect.left = bgRect.right + 6;
//Uncommenting this line will fix the button corners but breaks transparency
//DrawThemeParentBackgroundEx(hwnd, dc, DTPB_USECTLCOLORSTATIC, NULL);
DrawThemeBackground(hTheme, dc, BP_RADIOBUTTON, state, &bgRect, NULL);
if (text)
{
DrawThemeText(hTheme, dc, BP_RADIOBUTTON, state, text, lstrlenW(text), dtFlags, 0, &textRect);
}
}
else
{
// Code for rendering the radio when themes are not present
}
}
The method above is called from WM_DRAWITEM as shown below:
case WM_DRAWITEM:
{
LPDRAWITEMSTRUCT pDIS = (LPDRAWITEMSTRUCT)lParam;
hTheme = OpenThemeData(hDlg, L"BUTTON");
HDC dc = pDIS->hDC;
wchar_t sCaption[100];
GetWindowText(GetDlgItem(hDlg, pDIS->CtlID), sCaption, 100);
std::wstring staticText(sCaption);
DrawRadioControl(pDIS->hwndItem, hTheme, dc, radio_group.IsButtonChecked(pDIS->CtlID), pDIS->rcItem, staticText);
SetBkMode(dc, TRANSPARENT);
SetTextColor(hdcStatic, RGB(0,0,0));
return TRUE;
}
So my question is two parts I suppose:
Have I missed some other way to achieve my desired result?
Is it possible to fix the clipped button corners issue with my code and still have a transparent background
After looking at this on and off for nearly three months I've finally found a solution that I'm pleased with. What I eventually found was that the radio button edges were for some reason not being drawn by the routine within WM_DRAWITEM but that if I invalidated the radio button control's parent in a rectangle around the control, they appeared.
Since I could not find a single good example of this I'm providing the full code (in my own solution I have encapsulated my owner drawn controls into their own class, so you will need to provide some details such as whether the button is checked or not)
This is the creation of the radiobutton (adding it to the parent window) also setting GWL_UserData and subclassing the radiobutton:
HWND hWndControl = CreateWindow( _T("BUTTON"), caption, WS_CHILD | WS_VISIBLE | BS_OWNERDRAW,
xPos, yPos, width, height, parentHwnd, (HMENU) id, NULL, NULL);
// Using SetWindowLong and GWL_USERDATA I pass in the this reference, allowing my
// window proc toknow about the control state such as if it is selected
SetWindowLong( hWndControl, GWL_USERDATA, (LONG)this);
// And subclass the control - the WndProc is shown later
SetWindowSubclass(hWndControl, OwnerDrawControl::WndProc, 0, 0);
Since it is owner draw we need to handle the WM_DRAWITEM message in the parent window proc.
case WM_DRAWITEM:
{
LPDRAWITEMSTRUCT pDIS = (LPDRAWITEMSTRUCT)lParam;
hTheme = OpenThemeData(hDlg, L"BUTTON");
HDC dc = pDIS->hDC;
wchar_t sCaption[100];
GetWindowText(GetDlgItem(hDlg, pDIS->CtlID), sCaption, 100);
std::wstring staticText(sCaption);
// Controller here passes to a class that holds a map of all controls
// which then passes on to the correct instance of my owner draw class
// which has the drawing code I show below
controller->DrawControl(pDIS->hwndItem, hTheme, dc, pDIS->rcItem,
staticText, pDIS->CtlID, pDIS->itemState, pDIS->itemAction);
SetBkMode(dc, TRANSPARENT);
SetTextColor(hdcStatic, RGB(0,0,0));
CloseThemeData(hTheme);
return TRUE;
}
Here is the DrawControl method - it has access to class level variables to allow state to be managed since with owner draw this is not handled automatically.
void OwnerDrawControl::DrawControl(HWND hwnd, HTHEME hTheme, HDC dc, bool checked, RECT rcItem, std::wstring caption, int ctrlId, UINT item_state, UINT item_action)
{
// Check if we need to draw themed data
if (hTheme)
{
HWND parent = GetParent(hwnd);
static const int cb_size = 13;
RECT bgRect, textRect;
HFONT font = (HFONT)SendMessageW(hwnd, WM_GETFONT, 0, 0);
DWORD state;
// This method handles both radio buttons and checkboxes - the enums here
// are part of my own code, not Windows enums.
// We also have hot tracking - this is shown in the window subclass later
if (Type() == RADIO_BUTTON)
state = ((checked) ? RBS_CHECKEDNORMAL : RBS_UNCHECKEDNORMAL) | ((is_hot_) ? RBS_HOT : 0);
else if (Type() == CHECK_BOX)
state = ((checked) ? CBS_CHECKEDNORMAL : CBS_UNCHECKEDNORMAL) | ((is_hot_) ? RBS_HOT : 0);
GetClientRect(hwnd, &bgRect);
// the theme type is either BP_RADIOBUTTON or BP_CHECKBOX where these are Windows enums
DWORD theme_type = ThemeType();
GetThemeBackgroundContentRect(hTheme, dc, theme_type, state, &bgRect, &textRect);
DWORD dtFlags = DT_VCENTER | DT_SINGLELINE;
if (dtFlags & DT_SINGLELINE) /* Center the checkbox / radio button to the text. */
bgRect.top = bgRect.top + (textRect.bottom - textRect.top - cb_size) / 2;
/* adjust for the check/radio marker */
// The +3 and +6 are a slight fudge to allow the focus rectangle to show correctly
bgRect.bottom = bgRect.top + cb_size;
bgRect.left += 3;
bgRect.right = bgRect.left + cb_size;
textRect.left = bgRect.right + 6;
DrawThemeBackground(hTheme, dc, theme_type, state, &bgRect, NULL);
DrawThemeText(hTheme, dc, theme_type, state, caption.c_str(), lstrlenW(caption.c_str()), dtFlags, 0, &textRect);
// Draw Focus Rectangle - I still don't really like this, it draw on the parent
// mainly to work around the way DrawFocus toggles the focus rect on and off.
// That coupled with some of my other drawing meant this was the only way I found
// to get a reliable focus effect.
BOOL bODAEntire = (item_action & ODA_DRAWENTIRE);
BOOL bIsFocused = (item_state & ODS_FOCUS);
BOOL bDrawFocusRect = !(item_state & ODS_NOFOCUSRECT);
if (bIsFocused && bDrawFocusRect)
{
if ((!bODAEntire))
{
HDC pdc = GetDC(parent);
RECT prc = GetMappedRectanglePos(hwnd, parent);
DrawFocus(pdc, prc);
}
}
}
// This handles drawing when we don't have themes
else
{
TEXTMETRIC tm;
GetTextMetrics(dc, &tm);
RECT rect = { rcItem.left ,
rcItem.top ,
rcItem.left + tm.tmHeight - 1,
rcItem.top + tm.tmHeight - 1};
DWORD state = ((checked) ? DFCS_CHECKED : 0 );
if (Type() == RADIO_BUTTON)
DrawFrameControl(dc, &rect, DFC_BUTTON, DFCS_BUTTONRADIO | state);
else if (Type() == CHECK_BOX)
DrawFrameControl(dc, &rect, DFC_BUTTON, DFCS_BUTTONCHECK | state);
RECT textRect = rcItem;
textRect.left = rcItem.left + 19;
SetTextColor(dc, ::GetSysColor(COLOR_BTNTEXT));
SetBkColor(dc, ::GetSysColor(COLOR_BTNFACE));
DrawText(dc, caption.c_str(), -1, &textRect, DT_WORDBREAK | DT_TOP);
}
}
Next is the window proc that is used to subclass the radio button control - this
is called with all windows messages and handles several before then passing unhandled
ones on to the default proc.
LRESULT OwnerDrawControl::WndProc(HWND hWnd, UINT uMsg, WPARAM wParam,
LPARAM lParam, UINT_PTR uIdSubclass, DWORD_PTR dwRefData)
{
// Get the button parent window
HWND parent = GetParent(hWnd);
// The page controller and the OwnerDrawControl hold some information we need to draw
// correctly, such as if the control is already set hot.
st_mini::IPageController * controller = GetWinLong<st_mini::IPageController *> (parent);
// Get the control
OwnerDrawControl *ctrl = (OwnerDrawControl*)GetWindowLong(hWnd, GWL_USERDATA);
switch (uMsg)
{
case WM_LBUTTONDOWN:
if (controller)
{
int ctrlId = GetDlgCtrlID(hWnd);
// OnCommand is where the logic for things like selecting a radiobutton
// and deselecting the rest of the group lives.
// We also call our Invalidate method there, which redraws the radio when
// it is selected. The Invalidate method will be shown last.
controller->OnCommand(parent, ctrlId, 0);
return (0);
}
break;
case WM_LBUTTONDBLCLK:
// We just treat doubleclicks as clicks
PostMessage(hWnd, WM_LBUTTONDOWN, wParam, lParam);
break;
case WM_MOUSEMOVE:
{
if (controller)
{
// This is our hot tracking allowing us to paint the control
// correctly when the mouse is over it - it sets flags that get
// used by the above DrawControl method
if(!ctrl->IsHot())
{
ctrl->SetHot(true);
// We invalidate to repaint
ctrl->InvalidateControl();
// Track the mouse event - without this the mouse leave message is not sent
TRACKMOUSEEVENT tme;
tme.cbSize = sizeof(TRACKMOUSEEVENT);
tme.dwFlags = TME_LEAVE;
tme.hwndTrack = hWnd;
TrackMouseEvent(&tme);
}
}
return (0);
}
break;
case WM_MOUSELEAVE:
{
if (controller)
{
// Turn off the hot display on the radio
if(ctrl->IsHot())
{
ctrl->SetHot(false);
ctrl->InvalidateControl();
}
}
return (0);
}
case WM_SETFOCUS:
{
ctrl->InvalidateControl();
}
case WM_KILLFOCUS:
{
RECT rcItem;
GetClientRect(hWnd, &rcItem);
HDC dc = GetDC(parent);
RECT prc = GetMappedRectanglePos(hWnd, parent);
DrawFocus(dc, prc);
return (0);
}
case WM_ERASEBKGND:
return 1;
}
// Any messages we don't process must be passed onto the original window function
return DefSubclassProc(hWnd, uMsg, wParam, lParam);
}
Finally the last little piece of the puzzle is that you need to invalidate the control (redraw it) at the right times. I eventually found that invalidating the parent allowed the drawing to work 100% correctly. This was causing flicker until I realised that I could get away by only invalidating a rectangle as big as the radio check, rather than as big as the whole control including text as I had been.
void InvalidateControl()
{
// GetMappedRectanglePos is my own helper that uses MapWindowPoints
// to take a child control and map it to its parent
RECT rc = GetMappedRectanglePos(ctrl_, parent_);
// This was my first go, that caused flicker
// InvalidateRect(parent_, &rc_, FALSE);
// Now I invalidate a smaller rectangle
rc.right = rc.left + 13;
InvalidateRect(parent_, &rc, FALSE);
}
A lot of code and effort for something that should be simple - drawing a themed radio button over a background image. Hopefully the answer will save someone else some pain!
* One big caveat with this is it only works 100% correctly for owner controls that are over a background (such as a fill rectangle or an image). That is ok though, since it is only needed when drawing the radio control over a background.
I've done this some time ago as well. I remember the key was to just create the (radio) buttons as usual. The parent must be the dialog or window, not a tab control. You could do it differently but I created a memory dc (m_mdc) for the dialog and painted the background on that. Then add the OnCtlColorStatic and OnCtlColorBtn for your dialog:
virtual HBRUSH OnCtlColorStatic(HDC hDC, HWND hWnd)
{
RECT rc;
GetRelativeClientRect(hWnd, m_hWnd, &rc);
BitBlt(hDC, 0, 0, rc.right - rc.left, rc.bottom - rc.top, m_mdc, rc.left, rc.top, SRCCOPY);
SetBkColor(hDC, GetSysColor(COLOR_BTNFACE));
if (IsAppThemed())
SetBkMode(hDC, TRANSPARENT);
return (HBRUSH)GetStockObject(NULL_BRUSH);
}
virtual HBRUSH OnCtlColorBtn(HDC hDC, HWND hWnd)
{
return OnCtlColorStatic(hDC, hWnd);
}
The code uses some in-house classes and functions similar to MFC, but I think you should get the idea. As you can see it draws the background of these controls from the memory dc, that's key.
Give this a try and see if it works!
EDIT: If you add a tab control to the dialog and put the controls on the tab (that was the case in my app) you must capture it's background and copy it to the memory dc of the dialog. It's a bit of an ugly hack but it works, even if the machine is running some extravagant theme that uses a gradient tab background:
// calculate tab dispay area
RECT rc;
GetClientRect(m_tabControl, &rc);
m_tabControl.AdjustRect(false, &rc);
RECT rc2;
GetRelativeClientRect(m_tabControl, m_hWnd, &rc2);
rc.left += rc2.left;
rc.right += rc2.left;
rc.top += rc2.top;
rc.bottom += rc2.top;
// copy that area to background
HRGN hRgn = CreateRectRgnIndirect(&rc);
GetRelativeClientRect(m_hWnd, m_tabControl, &rc);
SetWindowOrgEx(m_mdc, rc.left, rc.top, NULL);
SelectClipRgn(m_mdc, hRgn);
SendMessage(m_tabControl, WM_PRINTCLIENT, (WPARAM)(HDC)m_mdc, PRF_CLIENT);
SelectClipRgn(m_mdc, NULL);
SetWindowOrgEx(m_mdc, 0, 0, NULL);
DeleteObject(hRgn);
Another interesting point, while we're busy now, to get it all non-flickering create the parent and children (buttons, statics, tabs etc) with the WS_CLIPCHILDREN and WS_CLIPSIBLINGS style. The the order of creation is essential: First create the controls you put on the tabs, then create the tab control. Not the other way around (although it feels more intuitive). That because the tab control should clip the area obscured by the controls on it :)
I can't immediately try this out, but so far as I recall, you don't need owner draw. You need to do this:
Return 1 from WM_ERASEBKGND.
Call DrawThemeParentBackground from WM_CTLCOLORSTATIC to draw the background there.
Return GetStockObject(NULL_BRUSH) from WM_CTLCOLORSTATIC.
Knowing the sizes and coordinates radio button, we will copy the
image to them closed.
Then we create a brush by means of
BS_PATTERN style CreateBrushIndirect
Farther according to the
usual scheme - we return handle to this brush in reply to COLOR -
the message (WM_CTLCOLORSTATIC).
I have no idea why you are doing it so difficult, this is best solved via CustomDrawing
This is my MFC Handler to draw a Notebook on a CTabCtrl control. I'm not really sure why i need to Inflate the Rectangle, because if i don't do it a black border is drawn.
And another conceptional bug MS made is IMHO that i have to overwrite the PreErase drawing phase instead of the PostErase. But if i do the later the checkbox is gone.
afx_msg void AguiRadioButton::OnCustomDraw(NMHDR* notify, LRESULT* res) {
NMCUSTOMDRAW* cd = (NMCUSTOMDRAW*)notify;
if (cd->dwDrawStage == CDDS_PREERASE) {
HTHEME theme = OpenThemeData(m_hWnd, L"Button");
CRect r = cd->rc; r.InflateRect(1,1,1,1);
DrawThemeBackground(theme, cd->hdc, TABP_BODY, 0, &r,NULL);
CloseThemeData(theme);
*res = 0;
}
*res = 0;
}
Here is a picture of my program:
As you can see, the icons aren't transparent, simply white. This is problematic, because I've coded the list-view to alternate colors and the white looks very ugly on grey.
Right now, I'm using a bitmap with a pink background for the icons, and using the pink color as a mask. Here's the code for my HIMAGELIST:
hImageList = ImageList_Create(16, 16, ILC_COLOR32 | ILC_MASK, ICON_COUNT, 0);
if (hImageList != NULL)
{
HBITMAP hBitmap = LoadBitmap(g_hInstance, MAKEINTRESOURCE(IDB_ICONS));
if (hBitmap != NULL)
{
ImageList_AddMasked(hImageList, hBitmap, RGB(0xFF, 0, 0xFF)); // pink mask
DeleteObject(hBitmap);
}
ImageList_SetBkColor(hImageList, CLR_NONE);
}
ListView_SetImageList(hWnd, hImageList, LVSIL_SMALL);
Here is the code for the list-view's Custom Draw (the alternating colors)
LRESULT WhiteFlagUI::PaintListView(__in HWND hwndListView, __in LPARAM lParam)
{
LPNMLVCUSTOMDRAW lpListDraw = reinterpret_cast<LPNMLVCUSTOMDRAW>(lParam);
switch (lpListDraw->nmcd.dwDrawStage)
{
case CDDS_PREPAINT:
return (CDRF_NOTIFYPOSTPAINT | CDRF_NOTIFYITEMDRAW | CDRF_NOTIFYSUBITEMDRAW);
break;
case (CDDS_PREPAINT | CDDS_ITEM):
{
RECT rect;
if (ListView_GetSubItemRect(hwndListView, lpListDraw->nmcd.dwItemSpec, lpListDraw->iSubItem, LVIR_BOUNDS, &rect))
{
COLORREF color;
// determine color
if (lpListDraw->nmcd.uItemState & CDIS_SELECTED)
color = RGB(157, 173, 215);
else if (lpListDraw->nmcd.dwItemSpec % 2)
color = RGB(240, 240, 240);
else
color = RGB(255, 255, 255);
// paint
HBRUSH hBrush = CreateSolidBrush(color);
if (hBrush != NULL)
{
FillRect(lpListDraw->nmcd.hdc, &rect, hBrush);
DeleteObject(hBrush);
}
// return color info
lpListDraw->clrTextBk = color;
return CDRF_NEWFONT;
}
}
break;
}
return CDRF_DODEFAULT;
}
Quite frankly, I'm completely lost as to how to approach this. Does anyone have any ideas?
I found a bit of a hack around this problem. If you set the background image to a blank white bitmap using ListView_SetBkImage it will force the icons to draw transparently. Unfortunately, doing this causes NM_CUSTOMDRAW to ignore the background color set with CDRF_NEWFONT. To get around it, call FillRect to fill background of the item in CDDS_ITEMPREPAINT and return CDRF_DODEFAULT or CDRF_NEWFONT if you are changing the foreground color as well.
I was faced with this problem as well.
I've solved it by adding SetBkColor(RGB(...)) where RGB(...) alternates from foreground color to background one in the custom draw procedure. I use 16x16 4b BMP with white background. Instead of using FillRect(), I set clrTextBk too. The last works for texts.
As I see from my experiments with CListCtrl, function SetBkColor() sets background color for icons only and does not for text (I found nothing about this in docs).
All this works only for non-empty items. To draw empty rows with this style, I override OnEraseBkgnd() notification function. For fully empty list, simple rectangles are drawn.
I hope this will help
Olexiy