I want to handle the user's doubleclick over a ListBox, but there's no way to handle the listbox activity because it doesn't send a message to the window. I have this:
LRESULT CALLBACK WindowProcedure (HWND hwnd, UINT message, WPARAM wParam, LPARAM lParam)
{
switch (message) /* handle the messages */
{
case WM_COMMAND:
{
switch(LOWORD(wParam))
{
case IDC_LISTBOX1:
{
if(HIWORD(wParam) == LBN_DBLCLK)
{
//...
}
//...
}
//...
}
//...
}
//...
}
return 0;
}
How can I handle the listbox messages?
Related
I want to use the Windows API to get keyboard input from a window. From what I have heard, I can create a callback function that will be called when some events happen. I just don't know how.
ModuleManager::ModuleManager() {
HWND getGameWindow = FindWindow(NULL, TEXT("GameName"));
wndProc = (WNDPROC)SetWindowLongPtrA(getGameWindow, GWLP_WNDPROC, 0);
}
LRESULT CALLBACK ModuleManager::WndProc(const HWND hwnd, unsigned int message, uintptr_t wParam, long lparam) {
if (message == WM_CHAR) {
for (Module* m : modules) {
if (m->getKeybinding() == wParam) {
m->isActive = !m->isActive; // toggle
}
}
}
return CallWindowProcA(wndProc, hwnd, message, wParam, lparam);
}
Here is my current code. I want to set a callback on WndProc function.
It seems i figured it out.
The callback function must be a static function for some reason.
So the correct code is following:
ModuleManager::ModuleManager() {
HWND getGameWindow = FindWindow(NULL, TEXT("GameName"));
wndProc = (WNDPROC)SetWindowLongPtrA(getGameWindow, GWLP_WNDPROC, (LONG_PTR) &ModuleManager::WndProc);
}
LRESULT CALLBACK ModuleManager::WndProc(const HWND hwnd, unsigned int message, uintptr_t wParam, long lparam) {
if (message == WM_CHAR) {
for (Module* m : modules) {
if (m->getKeybinding() == wParam) {
m->isActive = !m->isActive; // toggle
}
}
}
return CallWindowProcA(wndProc, hwnd, message, wParam, lparam);
}
The focus event on the combo box is generated twice.
this is the code for the Action Procedure of the Dialog box.
INT_PTR DialogBox::ActionProc(
HWND hwndDlg,
UINT message,
WPARAM wParam,
LPARAM lParam)
{
switch (message)
{
case WM_COMMAND:
{
switch (LOWORD(wParam))
{
case COMBOBOX:
{
if (CBN_SETFOCUS == HIWORD(wParam))
{
MessageBox(
hwndDlg,
CString("Test"),
CString("Test"),
(MB_ICONEXCLAMATION | MB_OK));
}
break;
}
default:
break;
}
break;
}
default:
break;
}
return INT_PTR(true);
}
the MessageBox Gets displayed twice(because the focus event is generated twice on the combo box). Is there a way to display it only once.
I have tried focussing to another element such as:
INT_PTR DialogBox::ActionProc(
HWND hwndDlg,
UINT message,
WPARAM wParam,
LPARAM lParam)
{
switch (message)
{
case WM_COMMAND:
{
switch (LOWORD(wParam))
{
case COMBOBOX:
{
if (CBN_SETFOCUS == HIWORD(wParam))
{
MessageBox(
hwndDlg,
CString("Test"),
CString("Test"),
(MB_ICONEXCLAMATION | MB_OK));
SendDlgItemMessage(
hwndDlg,
ANOTHER_CONTROL,
WM_SETFOCUS,
0,
0);
}
break;
}
default:
break;
}
break;
}
default:
break;
}
return INT_PTR(true);
}
Can some one tell me what i am doing wrong.
This is in Windows Desktop API.
I've got a C++ project in which I'm using the Winapi to develop a window with a button and I want to change the text of the button when it's being hovered. For example, changing "Click me" to "Click me NOW!", when hovered. I've tried searching but I've not found any good ways to do this.
I noticed that when user hovers, the WM_NOTIFY message is received, but I don't know how to ensure that it has been called by the mouse hover. I've found that I can use TrackMouseEvent to detect hovering, but it's limited to a period of time and I want to execute an action every time the user hovers the button.
Here is how I create a button:
HWND Button = CreateWindow("BUTTON", "Click me",
WS_VISIBLE | WS_CHILD | BS_DEFPUSHBUTTON | BS_NOTIFY,
20, 240, 120, 20,
hwnd, (HMENU)101, NULL, NULL);
And this my window procedure:
LRESULT CALLBACK WndProc(HWND hwnd, UINT msg, WPARAM wParam, LPARAM lParam)
{
switch (msg)
{
case WM_NOTIFY:
{
//??? Here is where I get a message everytime I hover the button, But I don't know any proper way to see if it has been executed by the button.
}
case WM_CREATE: //On Window Create
{
//...
}
case WM_COMMAND: //Command execution
{
//...
break;
}
case WM_DESTROY: //Form Destroyed
{
PostQuitMessage(0);
break;
}
}
return DefWindowProc(hwnd, msg, wParam, lParam);
}
Assuming you're using the common controls there is the BCN_HOTITEMCHANGE notification code for the WM_NOTIFY message. The message includes the NMBCHOTITEM structure, which includes information for whether the mouse is entering or leaving the hover area.
Here's an example:
LRESULT CALLBACK WndProc(HWND hwnd, UINT msg, WPARAM wParam, LPARAM lParam)
{
switch(msg)
{
case WM_NOTIFY:
{
LPNMHDR header = *reinterpret_cast<LPNMHDR>(lParam);
switch (header->code)
{
case BCN_HOTITEMCHANGE:
{
NMBCHOTITEM* hot_item = reinterpret_cast<NMBCHOTITEM*>(lParam);
// Handle to the button
HWND button_handle = header->hwndFrom;
// ID of the button, if you're using resources
UINT_PTR button_id = header->idFrom;
// You can check if the mouse is entering or leaving the hover area
bool entering = hot_item->dwFlags & HICF_ENTERING;
return 0;
}
}
return 0;
}
}
return DefWindowProcW(hwnd, msg, wParam, lParam);
}
You can check the code of the WM_NOTIFY message to see if it is a NM_HOVER message.
switch(msg)
{
case WM_NOTIFY:
if(((LPNMHDR)lParam)->code == NM_HOVER)
{
// Process the hover message
}
else if (...) // any other WM_NOTIFY messages you care about
{}
}
You can use simply SFML to do this.
Code:
RectangleShape button;
button.setPosition(Vector2f(50, 50));
button.setSize(Vector2f(100, 40));
button.setFillColor(Color::Green);
if(button.getGlobalBounds().contains(static_cast<Vector2f>(Mouse::getPosition(/*your
window name*/window)
{
button.setFillColor(Color::Red);
}
I've created a formview using the Visual Studio resource editor but I can't get it to show.
The procedure to handle it's messages is this:
BOOL CALLBACK DlgProc(HWND hDlg, UINT message, WPARAM wParam, LPARAM lParam)
{
switch(message)
{
case WM_INITDIALOG:
return TRUE;
case WM_COMMAND:
switch (LOWORD (wParam))
{
case IDC_BUTTONCancel:
EndDialog(hDlg,0);
return TRUE;
}
break;
}
return FALSE;
}
When a button is pressed in the main window I call:
DialogBox(hInst, MAKEINTRESOURCE(IDD_FORMVIEW), hwnd, (DLGPROC)DlgProc);
The main window freezes, but there is no dialog shown.
I'd appreciate some help. Thanks in advance.
I am trying to Subclass the Listbox and the Edit Control of a Combobox for some customasing reasons. Below is the code work . Subclassing for Edit Control is working perfect but Listbox is not getting the messeage of MouseDown.
void Subclass(HWND hComboBox)
{
HWND hEdit=FindWindowEx(hComboBox, NULL, WC_EDIT, NULL);
HWND hCombo=FindWindowEx(hComboBox, NULL, WC_LISTBOX, NULL);
SetProp(hEdit, TEXT("Wprc"), (HANDLE)GetWindowLongPtr(hEdit, GWL_WNDPROC));
SubclassWindow(hEdit, ComboBox_Proc);
SetProp(hCombo, TEXT("Wprc1"), (HANDLE)GetWindowLongPtr(hCombo, GWL_WNDPROC));
SubclassWindow(hCombo, ComboBox_Proc1);
}
static LRESULT CALLBACK ComboBox_Proc(HWND hwnd, UINT msg, WPARAM wParam, LPARAM lParam)
{
switch(msg)
{
case WM_CHAR:
break;
case WM_KEYDOWN:
break;
case WM_DESTROY:
SetWindowLongPtr(hwnd, GWLP_WNDPROC, (DWORD)GetProp(hwnd, TEXT("Wprc")));
RemoveProp(hwnd, TEXT("Wprc"));
break;
default:
return CallWindowProc((WNDPROC)GetProp(hwnd, TEXT("Wprc")), hwnd, msg, wParam, lParam);
}
return FALSE;
}
static LRESULT CALLBACK ComboBox_Proc1(HWND hwnd, UINT msg, WPARAM wParam, LPARAM lParam)
{
switch(msg)
{
case WM_LBUTTONDOWN:
//PROBLEM IS HERE
break;
case WM_DESTROY:
SetWindowLongPtr(hwnd, GWLP_WNDPROC, (DWORD)GetProp(hwnd, TEXT("Wprc1")));
RemoveProp(hwnd, TEXT("Wprc1"));
break;
default:
return CallWindowProc((WNDPROC)GetProp(hwnd, TEXT("Wprc1")), hwnd, msg, wParam, lParam);
}
return FALSE;
}
The ListBox part of a ComboBox is of type COMBOLBOX (with L).
The ComboLBox window is not a child of the ComboBox window.
The only way I found to subclass the COMBOLBOX control is as follows.
Windows sends the WM_CTLCOLORLISTBOX message to the COMBOBOX (no L) before the listbox is drawn. The lParam of this message contains the handle of the listbox.
case WM_CTLCOLORLISTBOX:
{
if ( !hSubclassedListBox )
{
hSubclassedListBox = (HWND)lParam;
SubclassWindow(hSubclassedListBox , MyLBProc);
}
}
Alsoo see this link for more information
For those who are using Visual Studio with WINVER set to 0500 or higher (Windows XP or later), you can use the GetComboBoxInfo function (passing the handle to the ComboBox), which will return (in a COMBOBOXINFO structure) the handles to both the Edit box and the ComboLBox (ListBox). The handles can then be used to get the CWnd-derived objects they represent.