Wie bekomme ich ein Kind Richedit Control, um die Größenänderung in den nach oben und nach unten gerichteten Richtungen ⇐ C++

[Anonymous]

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// RichEditReSizeable_cpp_win32.cpp : Defines the entry point for the application.
//

#include "framework.h"
#include "RichEditReSizeable_cpp_win32.h"

#define MAX_LOADSTRING 100

#ifndef MSFTEDIT_CLASS
#define MSFTEDIT_CLASS TEXT("RICHEDIT50W")
#endif

// Global Variables:
HINSTANCE hInst;                                // current instance
WCHAR szTitle[MAX_LOADSTRING];                  // The title bar text
WCHAR szWindowClass[MAX_LOADSTRING];            // the main window class name

// Forward declarations of functions included in this code module:
ATOM                MyRegisterClass(HINSTANCE hInstance);
BOOL                InitInstance(HINSTANCE, int);
LRESULT CALLBACK    WndProc(HWND, UINT, WPARAM, LPARAM);
INT_PTR CALLBACK    About(HWND, UINT, WPARAM, LPARAM);

HWND hMainWnd;      // Global handle for the main window.
HWND hRichEdit;     // Global handle for the RichEdit control.

// Define initial position and size (you can change these as needed)
int x = 0;
int y = 0;
int width = 300;   // or get the client rect to size dynamically
int height = 100;
HWND hParent = hMainWnd; // or whatever the intended parent is

// Global (or static) variables to track resizing:
bool g_bResizing = false;
int  g_nDragStartY = 0;
int  g_nOrigRichEditHeight = 0;

int APIENTRY wWinMain(_In_ HINSTANCE hInstance,
_In_opt_ HINSTANCE hPrevInstance,
_In_ LPWSTR    lpCmdLine,
_In_ int       nCmdShow)
{
UNREFERENCED_PARAMETER(hPrevInstance);
UNREFERENCED_PARAMETER(lpCmdLine);

// TODO: Place code here.
LoadLibrary(TEXT("Msftedit.dll"));

// Initialize global strings
LoadStringW(hInstance, IDS_APP_TITLE, szTitle, MAX_LOADSTRING);
LoadStringW(hInstance, IDC_RICHEDITRESIZEABLECPPWIN32, szWindowClass, MAX_LOADSTRING);
MyRegisterClass(hInstance);

// Perform application initialization:
if (!InitInstance (hInstance, nCmdShow))
{
return FALSE;
}

HACCEL hAccelTable = LoadAccelerators(hInstance, MAKEINTRESOURCE(IDC_RICHEDITRESIZEABLECPPWIN32));

MSG msg;

// Main message loop:
while (GetMessage(&msg, nullptr, 0, 0))
{
if (!TranslateAccelerator(msg.hwnd, hAccelTable, &msg))
{
TranslateMessage(&msg);
DispatchMessage(&msg);
}
}

return (int) msg.wParam;
}

//
//  FUNCTION: MyRegisterClass()
//
//  PURPOSE: Registers the window class.
//
ATOM MyRegisterClass(HINSTANCE hInstance)
{
WNDCLASSEXW wcex;

wcex.cbSize = sizeof(WNDCLASSEX);

wcex.style          = CS_HREDRAW | CS_VREDRAW;
wcex.lpfnWndProc    = WndProc;
wcex.cbClsExtra     = 0;
wcex.cbWndExtra     = 0;
wcex.hInstance      = hInstance;
wcex.hIcon          = LoadIcon(hInstance, MAKEINTRESOURCE(IDI_RICHEDITRESIZEABLECPPWIN32));
wcex.hCursor        = LoadCursor(nullptr, IDC_ARROW);
wcex.hbrBackground  = (HBRUSH)(COLOR_WINDOW+1);
wcex.lpszMenuName   = MAKEINTRESOURCEW(IDC_RICHEDITRESIZEABLECPPWIN32);
wcex.lpszClassName  = szWindowClass;
wcex.hIconSm        = LoadIcon(wcex.hInstance, MAKEINTRESOURCE(IDI_SMALL));

return RegisterClassExW(&wcex);
}

//
//   FUNCTION: InitInstance(HINSTANCE, int)
//
//   PURPOSE: Saves instance handle and creates main window
//
//   COMMENTS:
//
//        In this function, we save the instance handle in a global variable and
//        create and display the main program window.
//
BOOL InitInstance(HINSTANCE hInstance, int nCmdShow)
{
hInst = hInstance;  // Store instance handle in our global variable

hMainWnd = CreateWindowW(szWindowClass, szTitle, WS_OVERLAPPEDWINDOW,
CW_USEDEFAULT, 0, CW_USEDEFAULT, 0, nullptr, nullptr, hInstance, nullptr);

if (!hMainWnd)
{
return FALSE;
}

ShowWindow(hMainWnd, nCmdShow);
UpdateWindow(hMainWnd);

// Create the RichEdit control with hMainWnd as its parent.
hRichEdit = CreateWindowEx(
WS_EX_CLIENTEDGE,
MSFTEDIT_CLASS,
NULL,
WS_CHILD | WS_VISIBLE | ES_MULTILINE | WS_VSCROLL | ES_AUTOVSCROLL,
x, y, width, height,         // these can be updated immediately or in WM_SIZE
hMainWnd,                    // use hMainWnd directly
(HMENU)ID_RICHEDIT,          // control ID (make sure ID_RICHEDIT is defined)
hInstance,
NULL
);

// Optionally, reposition the RichEdit control immediately:
RECT rc;
GetClientRect(hMainWnd, &rc);
int clientHeight = rc.bottom - rc.top;
int clientWidth = rc.right - rc.left;
int richEditHeight = clientHeight / 4;
int richEditTop = clientHeight - richEditHeight;
SetWindowPos(hRichEdit, NULL, 0, richEditTop, clientWidth, richEditHeight, SWP_NOZORDER);

return TRUE;
}

//
//  FUNCTION: WndProc(HWND, UINT, WPARAM, LPARAM)
//
//  PURPOSE: Processes messages for the main window.
//
//  WM_COMMAND  - process the application menu
//  WM_PAINT    - Paint the main window
//  WM_DESTROY  - post a quit message and return
//
//
LRESULT CALLBACK WndProc(HWND hWnd, UINT message, WPARAM wParam, LPARAM lParam)
{
switch (message)
{
case WM_LBUTTONDOWN:
{
// Get the click point in client coordinates.
POINT pt = { LOWORD(lParam), HIWORD(lParam) };

// Get the RichEdit control's rectangle in client coordinates.
RECT rcRich;
GetWindowRect(hRichEdit, &rcRich);
// Map the rectangle from screen to client coordinates.
MapWindowPoints(HWND_DESKTOP, hMainWnd, (LPPOINT)&rcRich, 2);

// Check if the click is within the top 10 pixels of the RichEdit control.
if (pt.y >= rcRich.top && pt.y   maxHeight)
newHeight = maxHeight;

// The new top of the RichEdit is the bottom of the client area minus the new height.
int richEditTop = rcClient.bottom - newHeight;
SetWindowPos(hRichEdit, NULL, 0, richEditTop, rcClient.right, newHeight, SWP_NOZORDER);
}
}
break;

case WM_LBUTTONUP:
{
if (g_bResizing)
{
g_bResizing = false;
ReleaseCapture();
}
}
break;

// Your existing message handling...
case WM_COMMAND:
{
int wmId = LOWORD(wParam);
switch (wmId)
{
case IDM_ABOUT:
DialogBox(hInst, MAKEINTRESOURCE(IDD_ABOUTBOX), hWnd, About);
break;
case IDM_EXIT:
DestroyWindow(hWnd);
break;
default:
return DefWindowProc(hWnd, message, wParam, lParam);
}
}
break;

case WM_PAINT:
{
PAINTSTRUCT ps;
HDC hdc = BeginPaint(hWnd, &ps);
EndPaint(hWnd, &ps);
}
break;

case WM_SIZE:
{
RECT rcClient;
GetClientRect(hWnd, &rcClient);

// Get the current height of the RichEdit control
RECT rcRichEdit;
GetWindowRect(hRichEdit, &rcRichEdit);
MapWindowPoints(HWND_DESKTOP, hWnd, (LPPOINT)&rcRichEdit, 2);
int richEditHeight = rcRichEdit.bottom - rcRichEdit.top;

// Keep the RichEdit control anchored at the bottom
int richEditTop = rcClient.bottom - richEditHeight;
SetWindowPos(hRichEdit, NULL, 0, richEditTop, rcClient.right, richEditHeight, SWP_NOZORDER);
}
break;

case WM_DESTROY:
PostQuitMessage(0);
break;

default:
return DefWindowProc(hWnd, message, wParam, lParam);
}
return 0;
}

// Message handler for about box.
INT_PTR CALLBACK About(HWND hDlg, UINT message, WPARAM wParam, LPARAM lParam)
{
UNREFERENCED_PARAMETER(lParam);
switch (message)
{
case WM_INITDIALOG:
return (INT_PTR)TRUE;

case WM_COMMAND:
if (LOWORD(wParam) == IDOK || LOWORD(wParam) == IDCANCEL)
{
EndDialog(hDlg, LOWORD(wParam));
return (INT_PTR)TRUE;
}
break;
}
return (INT_PTR)FALSE;
}

Die Code kompiliert und wird ausgeführt. Das Bild hat das resultierende Fenster. Ich möchte, dass sich der Cursor in ein Symbol für die Größe der Größe wechselt, wenn der Mauszeiger an oder in der Nähe der oberen Grenze des Richedits platziert wird. Der Richedit sollte dann die Größe ändern, wenn der Benutzer diesen Bereich klickt und nach oben oder nach unten zieht. Die linke und rechte Position des Richedit kann nach links und rechter Rand des Hauptfensters gehalten werden und sollte mit dem Hauptfenster, hmainwnd . Richedit -Kontrolle, um die Größe in der beschriebenen Art zu ändern?