If I have five Win32 static controls, how can I set one of them with a specific foreground color? [duplicate] - c++

Question

This question already has answers here:
Set static text color Win32
(1 answer)
In Win32, how can the colour of STATIC text be changed?
(2 answers)
Closed 4 years ago.
As far as I can tell, this is not a duplicate question because it's dealing with a collection of static (label) controls. I want to set a foreground color to a specific one that I call in my thin OOP library.
I call a static control a "Label" in my library. This is how I set the color:
void Label::setForeColor(const BYTE red, const BYTE green, const BYTE blue)
{
m_foreColor = RGB(red, green, blue);
}
This just sets a COLORRREF that the control should have. I'm having trouble finding a solution to send a message for that specific static control without affecting others.
Many say to use WM_CTLCOLORSTATIC, but I already am for transparency of controls:
case WM_CTLCOLORBTN:
case WM_CTLCOLORSTATIC:
{
char class_Name[100];
WNDCLASS lpcls{};
SetBkMode((HDC)wParam, TRANSPARENT);
// SetTextColor((HDC)wParam, RGB(0, 0, 255)); This works and can set all statics as blue, but I need just one control blue.
GetClassName(hWnd, class_Name, 100);
GetClassInfo(frm.getInstance(), class_Name, &lpcls);
return (LRESULT)lpcls.hbrBackground;
}
But here's the issue: I may have more than one label on a window, so this goes beyond than just setting a single label as most examples show. There may be 5 labels with 5 different colors.
This is the top layer:
Label lblName("This is a label.", 330, 303);
lblName.setVisible(true);
lblName.setForeColor(0, 0, 255);
lblName.setFont("Garamond", 24, false, false, false);
lblName.OnMouseOver(lblName_onMouseOver);
Ideally, I would like to set the color in my setFont() function by sending a message.
bool Label::setFont(const std::string &fontName, const int size, const bool bold,
const bool italic, const bool underlined)
{
DWORD dwItalic;
DWORD dwBold;
DWORD dwUnderlined;
SIZE linkSize;
HFONT old_font;
dwItalic = (italic) ? TRUE : FALSE;
dwBold = (bold) ? FW_BOLD : FW_DONTCARE;
dwUnderlined = (underlined) ? TRUE : FALSE;
m_font = CreateFont(size, 0, 0, 0, dwBold, dwItalic, dwUnderlined, FALSE,
ANSI_CHARSET, OUT_DEFAULT_PRECIS, CLIP_DEFAULT_PRECIS, DEFAULT_QUALITY,
DEFAULT_PITCH | FF_SWISS, fontName.c_str());
SendMessage(m_handle, WM_SETFONT, WPARAM(m_font), TRUE);
// Calculate the correct width and height size
HDC hDC = GetDC(m_handle);
old_font = SelectFont(hDC, m_font);
GetTextExtentPoint32(hDC, m_text.c_str(), (int)m_text.length(), &linkSize);
setSize(linkSize.cx, size);
DeleteFont(old_font);
ReleaseDC(m_handle, hDC);
return true;
}
Finally, this is how I retrieve my labels that I'm interested in. I wonder if I need to set the font color similarly.
case WM_MOUSEMOVE:
{
X3D::Windows::Control *ctrl = (X3D::Windows::Control*) dwRefData;
// Check if this is a X3D Label control.
X3D::Windows::Label *lbl = dynamic_cast<X3D::Windows::Label*>(ctrl);
if (lbl)
{
lbl->setHovering(true);
lbl->invokeOnMouseHover();
}
else
{
lbl->setHovering(false);
}
break;
}
Overall question: If I have five Win32 static controls, how can I set one of them with a specific foreground color?
Update:
This is my current code. Assert() is barking at me: Expression: map/set iterator not dereferencable
case WM_CTLCOLORBTN:
case WM_CTLCOLORSTATIC:
{
char class_Name[100];
WNDCLASS lpcls{};
SetBkMode((HDC)wParam, TRANSPARENT);
GetClassName(hWnd, class_Name, 100);
GetClassInfo(frm.getInstance(), class_Name, &lpcls);
for (int i = 0; i < frm.getControlCount(); i++)
{
if (frm.getControls().find(i)->second->getHandle() == (HWND)lParam)
{
// Obtain the control associated with the id.
X3D::Windows::Control *ctrl = frm.getControls().find(i)->second;
if (ctrl == NULL)
return 0;
// Check if this is a X3D Label control.
Label *lbl = dynamic_cast<X3D::Windows::Label*>(ctrl);
if (lbl != NULL)
{
SetTextColor((HDC)wParam, lbl->getForeColor());
break;
}
}
}
return (LRESULT)lpcls.hbrBackground;
}
Update:
App runs, but the font color isn't updating. Something wrong in this?
int id = GetDlgCtrlID((HWND)lParam);
// Obtain the control associated with the id.
X3D::Windows::Control *ctrl = frm.getControls().at(id);
if (ctrl == NULL)
return 0;
// Check if this is a X3D Label control.
Label *lbl = dynamic_cast<X3D::Windows::Label*>(ctrl);
if (lbl != NULL)
{
SetTextColor((HDC)wParam, lbl->getForeColor());
break;
}
Tried this too:
int id = GetDlgCtrlID((HWND)lParam);
// Obtain the control associated with the id.
X3D::Windows::Control *ctrl = frm.getControls().find(id)->second;
if (ctrl == NULL)
return 0;
If all of that looks correct, I'll just have to debug it tomorrow.

Answer 1

WM_CTLCOLORSTATIC is sent multiple times, you can choose to take different actions depending on which child window is generating it.
As shown on MSDN, the lParam that arrives with the message is the HWND for the control. Compare it directly, or GetDlgCtrlID() if you want to work with dialog item IDs.
No need to do anything special in the subclass wndproc, because WM_CTLCOLORSTATIC is sent to the parent window.
But there is no message to send to change the color or font, because the STATIC window class doesn't use a permanent device context per label (which is a good thing, because many programs have a lot of labels). So the text configuration like color and font need to be reapplied to the DC each time it is borrowed from the pool. WM_CTLCOLORSTATIC is sent to the parent window at the ideal time to do this.
If your setter for the color is called, be sure to use InvalidateRect() to trigger a repaint. That repaint will send WM_CTLCOLORSTATIC again, giving you the opportunity to act on your updated color.