Something frequently asked. How to make a modal popup window?
' ########################################################################################
' Microsoft Windows
' File: CW_PopupWindow.fbtpl
' Contents: CWindow with a modal popup window
' Compiler: FreeBasic 32 & 64 bit
' Copyright (c) 2016 Jose Roca. Freeware. Use at your own risk.
' THIS CODE AND INFORMATION IS PROVIDED "AS IS" WITHOUT WARRANTY OF ANY KIND, EITHER
' EXPRESSED OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE IMPLIED WARRANTIES OF
' MERCHANTABILITY AND/OR FITNESS FOR A PARTICULAR PURPOSE.
' ########################################################################################
#define unicode
#INCLUDE ONCE "windows.bi"
#INCLUDE ONCE "Afx/CWindow.inc"
USING Afx.CWindowClass
CONST IDC_POPUP = 1001
DECLARE FUNCTION WinMain (BYVAL hInstance AS HINSTANCE, _
BYVAL hPrevInstance AS HINSTANCE, _
BYVAL szCmdLine AS ZSTRING PTR, _
BYVAL nCmdShow AS LONG) AS LONG
END WinMain(GetModuleHandleW(""), NULL, COMMAND(), SW_NORMAL)
DECLARE FUNCTION WndProc (BYVAL hWnd AS HWND, BYVAL uMsg AS UINT, BYVAL wParam AS WPARAM, BYVAL lParam AS LPARAM) AS LRESULT
DECLARE FUNCTION PopupWindow (BYVAL hParent AS HWND) AS LONG
DECLARE FUNCTION PopupWndProc (BYVAL hWnd AS HWND, BYVAL uMsg AS UINT, BYVAL wParam AS WPARAM, BYVAL lParam AS LPARAM) AS LRESULT
' ========================================================================================
' Main
' ========================================================================================
FUNCTION WinMain (BYVAL hInstance AS HINSTANCE, _
BYVAL hPrevInstance AS HINSTANCE, _
BYVAL szCmdLine AS ZSTRING PTR, _
BYVAL nCmdShow AS LONG) AS LONG
' // Set process DPI aware
AfxSetProcessDPIAware
DIM pWindow AS CWindow
pWindow.Create(NULL, "CWindow with a popup window", @WndProc)
pWindow.SetClientSize(500, 320)
pWindow.Center
' // Add a button without position or size (it will be resized in the WM_SIZE message).
pWindow.AddControl("Button", pWindow.hWindow, IDC_POPUP, "&Popup", 350, 250, 75, 23)
FUNCTION = pWindow.DoEvents(nCmdShow)
END FUNCTION
' ========================================================================================
' ========================================================================================
' Window procedure
' ========================================================================================
FUNCTION WndProc (BYVAL hWnd AS HWND, BYVAL uMsg AS UINT, BYVAL wParam AS WPARAM, BYVAL lParam AS LPARAM) AS LRESULT
DIM hDC AS HDC
DIM pPaint AS PAINTSTRUCT
DIM rc AS RECT
DIM pWindow AS CWindow PTR
SELECT CASE uMsg
CASE WM_CREATE
EXIT FUNCTION
CASE WM_COMMAND
' // If ESC key pressed, close the application sending an WM_CLOSE message
SELECT CASE LOWORD(wParam)
CASE IDCANCEL
IF HIWORD(wParam) = BN_CLICKED THEN
SendMessageW hwnd, WM_CLOSE, 0, 0
EXIT FUNCTION
END IF
CASE IDC_POPUP
IF HIWORD(wParam) = BN_CLICKED THEN
PopupWindow(hwnd)
EXIT FUNCTION
END IF
END SELECT
CASE WM_SIZE
IF wParam <> SIZE_MINIMIZED THEN
' // Resize the buttons
pWindow = CAST(CWindow PTR, GetWindowLongPtr(hwnd, 0))
pWindow->MoveWindow GetDlgItem(hwnd, IDCANCEL), pWindow->ClientWidth - 120, pWindow->ClientHeight - 50, 75, 23, CTRUE
END IF
CASE WM_DESTROY
PostQuitMessage(0)
EXIT FUNCTION
END SELECT
FUNCTION = DefWindowProcW(hWnd, uMsg, wParam, lParam)
END FUNCTION
' ========================================================================================
' ========================================================================================
' Popup window procedure
' ========================================================================================
FUNCTION PopupWindow (BYVAL hParent AS HWND) AS LONG
DIM pWindow AS CWindow
pWindow.Create(hParent, "Popup window", @PopupWndProc, , , , , _
WS_VISIBLE OR WS_CAPTION OR WS_POPUPWINDOW OR WS_THICKFRAME, WS_EX_WINDOWEDGE)
pWindow.Brush = GetStockObject(WHITE_BRUSH)
pWindow.SetClientSize(300, 200)
pWindow.Center(pWindow.hWindow, hParent)
' / Process Windows messages
FUNCTION = pWindow.DoEvents
END FUNCTION
' ========================================================================================
' ========================================================================================
' Popup window procedure
' ========================================================================================
FUNCTION PopupWndProc (BYVAL hWnd AS HWND, BYVAL uMsg AS UINT, BYVAL wParam AS WPARAM, BYVAL lParam AS LPARAM) AS LRESULT
DIM hOldFont AS HFONT
STATIC hNewFont AS HFONT
SELECT CASE uMsg
CASE WM_CREATE
' // Get a pointer to the CWindow class from the CREATESTRUCT structure
DIM pCreateStruct AS CREATESTRUCT PTR = CAST(CREATESTRUCT PTR, lParam)
DIM pWindow AS CWindow PTR = CAST(CWindow PTR, pCreateStruct->lpCreateParams)
' // Create a new font scaled according the DPI ratio
IF pWindow->DPI <> 96 THEN hNewFont = pWindow->CreateFont("Tahoma", 9)
' Disable parent window to make popup window modal
EnableWindow GetParent(hwnd), FALSE
EXIT FUNCTION
CASE WM_COMMAND
SELECT CASE LOWORD(wParam)
' // If ESC key pressed, close the application sending an WM_CLOSE message
CASE IDCANCEL
IF HIWORD(wParam) = BN_CLICKED THEN
SendMessageW hwnd, WM_CLOSE, 0, 0
EXIT FUNCTION
END IF
END SELECT
CASE WM_PAINT
DIM rc AS RECT, ps AS PAINTSTRUCT, hDC AS HANDLE
hDC = BeginPaint(hWnd, @ps)
IF hNewFont THEN hOldFont = CAST(HFONT, SelectObject(hDC, CAST(HGDIOBJ, hNewFont)))
GetClientRect(hWnd, @rc)
DrawTextW(hDC, "Hello, World!", -1, @rc, DT_SINGLELINE or DT_CENTER or DT_VCENTER)
IF hNewFont THEN SelectObject(hDC, CAST(HGDIOBJ, CAST(HFONT, hOldFont)))
EndPaint(hWnd, @ps)
EXIT FUNCTION
CASE WM_CLOSE
' // Enables parent window keeping parent's zorder
EnableWindow GetParent(hwnd), CTRUE
' // Don't exit; let DefWindowProcW perform the default action
CASE WM_DESTROY
' // Destroy the new font
IF hNewFont THEN DeleteObject(CAST(HGDIOBJ, hNewFont))
' // End the application by sending an WM_QUIT message
PostQuitMessage(0)
EXIT FUNCTION
END SELECT
FUNCTION = DefWindowProcW(hWnd, uMsg, wParam, lParam)
END FUNCTION
' ========================================================================================