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[WinAPI] Ignorowanie komunikatu WM_LBUTTONDOWN / UP » 2017-11-14 20:39:20 Próbuję zrobić prosty program umożliwiający narysowanie prostokąta, koła lub trójkąta po kliknięciu myszy, przejechaniu do kolejnej współrzędnej i puszczeniu przycisku. Pomimo klikania odpowiedniego przycisku program ignoruje ten case i nie wywołuje funkcji rysowania. Błąd leży prawdopodobnie w WndProc(), ale nie potrafię go odnaleźć. Kod całego programu: #include <windows.h>
#include <wchar.h>
LPCWSTR ClassName = TEXT( "Aplikacja testowa" );
LRESULT CALLBACK WndProc( HWND hwnd, UINT msg, WPARAM wParam, LPARAM lParam );
void CreatePBs( HDC & hdc, HBRUSH * brush, HPEN * pen );
void DrawMenu( HWND hwnd, HDC & hdc, HBRUSH * brush, HPEN * pen, RECT & cr );
void Draw( HWND hwnd, int shape, BOOL transparent, HBRUSH * brush, HPEN * pen, int color, POINT & start, POINT & end );
int ChooseShape( POINT & cursor, int shape, RECT & cr );
int PickColor( POINT & cursor, int color, RECT & cr );
int WINAPI WinMain( HINSTANCE hInstance, HINSTANCE hPrevInstance,
LPSTR lpCmdLine, int nCmdShow )
{
MSG Komunikat;
WNDCLASSEX wc = {
sizeof( WNDCLASSEX ),
CS_VREDRAW | CS_HREDRAW,
WndProc,
0,
0,
hInstance,
0,
LoadCursor( NULL, IDC_ARROW ),
( HBRUSH )( COLOR_WINDOW + 0 ),
NULL,
ClassName,
0
};
if( !RegisterClassEx( & wc ) )
{
MessageBox( NULL, TEXT( "Błąd rejestracji tego okna!" ), TEXT( "Problem..." ),
MB_ICONEXCLAMATION | MB_OK );
return 1;
}
HWND hwnd = CreateWindowEx( WS_EX_CLIENTEDGE, ClassName, TEXT( "Aplikacja testowa" ), WS_OVERLAPPEDWINDOW,
CW_USEDEFAULT, CW_USEDEFAULT, 640, 490, NULL, NULL, hInstance, 0 );
if( hwnd == NULL )
{
MessageBox( NULL, TEXT( "Błąd utworzenia okna." ), TEXT( "Problem..." ), MB_ICONEXCLAMATION );
UnregisterClass( ClassName, hInstance );
return 1;
}
ShowWindow( hwnd, nCmdShow );
UpdateWindow( hwnd );
while( GetMessage( & Komunikat, NULL, 0, 0 ) )
{
TranslateMessage( & Komunikat );
DispatchMessage( & Komunikat );
}
UnregisterClass( ClassName, hInstance );
return Komunikat.wParam;
}
LRESULT CALLBACK WndProc( HWND hwnd, UINT msg, WPARAM wParam, LPARAM lParam )
{
PAINTSTRUCT ps;
HDC hdc;
RECT cr;
HBRUSH brush[ 16 ];
HPEN pen[ 16 ];
int state = 0, shape, color;
BOOL lBtnDwn = false, transparent = true;
POINT start, end;
switch( msg )
{
case WM_CLOSE:
DestroyWindow( hwnd );
return 0;
case WM_DESTROY:
PostQuitMessage( 0 );
break;
case WM_PAINT:
{
hdc = BeginPaint( hwnd, & ps );
CreatePBs( hdc, brush, pen );
DrawMenu( hwnd, hdc, brush, pen, cr );
EndPaint( hwnd, & ps );
break;
}
case WM_GETMINMAXINFO:
{
LPMINMAXINFO lpMMI =( LPMINMAXINFO ) lParam;
lpMMI->ptMinTrackSize.x = 300;
lpMMI->ptMinTrackSize.y = 490;
break;
}
case WM_MOUSEMOVE:
{
POINT cursor;
GetCursorPos( & cursor );
ScreenToClient( hwnd, & cursor );
GetClientRect( hwnd, & cr );
TCHAR buff[ 40 ];
if(( cursor.x < cr.right - 100 ) &&( cursor.y < cr.bottom ) )
state = 1;
else if(( cursor.x >= cr.right - 85 ) &&( cursor.y < 325 ) )
state = 2;
else if(( cursor.y > 360 ) &&( cursor.y < 425 ) )
state = 3;
swprintf_s( buff, 40, TEXT( "Paint (x: %d, y: %d), state: %d" ), cursor.x, cursor.y, state );
SetWindowText( hwnd, buff );
break;
}
case WM_LBUTTONDOWN:
{
POINT cursor;
GetCursorPos( & cursor );
ScreenToClient( hwnd, & cursor );
if( state == 2 )
{
color = PickColor( cursor, color, cr );
transparent = false;
}
if( state == 3 )
shape = ChooseShape( cursor, shape, cr );
if( !lBtnDwn && state == 1 )
{
lBtnDwn = true;
GetCursorPos( & start );
ScreenToClient( hwnd, & start );
}
break;
}
case WM_LBUTTONUP:
{
HDC hdc = GetDC( hwnd );
CreatePBs( hdc, brush, pen );
GetCursorPos( & end );
ScreenToClient( hwnd, & end );
if( state == 1 ) Draw( hwnd, shape, transparent, brush, pen, color, start, end );
ReleaseDC( hwnd, hdc );
lBtnDwn = false;
break;
}
default:
return DefWindowProc( hwnd, msg, wParam, lParam );
}
return 0;
}
void CreatePBs( HDC & hdc, HBRUSH * brush, HPEN * pen )
{
COLORREF color[ 16 ] =
{
0x000000, 0x777777,
0x000080, 0x0000FF,
0x004000, 0x00FF00,
0x008080, 0x00FFFF,
0x800000, 0xFF0000,
0x800040, 0xFF00FF,
0x808040, 0xFFFF00,
0x806060, 0xFFFFFF
};
for( int i = 0; i < 16; i++ )
{
brush[ i ] = CreateSolidBrush( color[ i ] );
pen[ i ] = CreatePen( PS_SOLID, 1, color[ i ] );
}
}
void DrawMenu( HWND hwnd, HDC & hdc, HBRUSH * brush, HPEN * pen, RECT & cr )
{
enum colors { black, gray, darkred, red, darkgreen, green,
darkyellow, yellow, darkblue, blue, purple, pink,
seal, lightblue, darkgray, white };
HBRUSH bkMenu = CreateSolidBrush( 0xC0C0C0 );
HBRUSH OldBrush =( HBRUSH ) SelectObject( hdc, brush[ white ] );
HPEN OldPen =( HPEN ) SelectObject( hdc, pen[ black ] );
GetClientRect( hwnd, & cr );
Rectangle( hdc, cr.left, cr.top, cr.right, cr.bottom );
SelectObject( hdc, bkMenu );
SelectObject( hdc, pen[ blue ] );
Rectangle( hdc, cr.right - 100, 1, cr.right - 1, cr.bottom - 1 );
for( int i = 0; i < 16; i++ )
{
SelectObject( hdc, pen[ i ] );
SelectObject( hdc, brush[ i++ ] );
Rectangle( hdc, cr.right - 85, 20 * i + 25, cr.right - 60, 20 * i + cr.top );
SelectObject( hdc, pen[ i ] );
SelectObject( hdc, brush[ i ] );
Rectangle( hdc, cr.right - 40, 20 * i + 25, cr.right - 15, 20 * i + cr.top );
}
SelectObject( hdc, pen[ black ] );
for( int i = 0; i < 2; i++ )
{
Rectangle( hdc, cr.right - 85, 40 * i + 360, cr.right - 60, 40 * i + 385 );
Rectangle( hdc, cr.right - 40, 40 * i + 360, cr.right - 15, 40 * i + 385 );
}
POINT triangle[ 3 ] = { { cr.right - 35, 365 }, { cr.right - 20, 365 }, { cr.right - 28, 380 } };
Polygon( hdc, triangle, 3 );
for( int i = 0; i < 3; i++ )
{
triangle[ i ].y += 40;
}
SelectObject( hdc, brush[ black ] );
Polygon( hdc, triangle, 3 );
Rectangle( hdc, cr.right - 80, 365, cr.right - 65, 380 );
Ellipse( hdc, cr.right - 80, 405, cr.right - 65, 420 );
for( int i = 0; i < 16; i++ )
{
DeleteObject( brush[ i ] );
DeleteObject( pen[ i ] );
}
DeleteObject( bkMenu );
}
void Draw( HWND hwnd, int shape, BOOL transparent, HBRUSH * brush, HPEN * pen, int color, POINT & start, POINT & end )
{
HDC hdc = GetDC( hwnd );
if( !transparent )
{
SelectObject( hdc, brush[ color ] );
SelectObject( hdc, pen[ color ] );
}
else
{
SelectObject( hdc, GetStockObject( NULL_BRUSH ) );
SelectObject( hdc, pen[ color ] );
}
switch( shape )
{
case 1:
{
Rectangle( hdc, start.x, start.y, end.x, end.y );
}
break;
case 2:
{
Ellipse( hdc, start.x, start.y, end.x, end.y );
}
break;
case 3:
{
SelectObject( hdc, GetStockObject( NULL_BRUSH ) );
POINT point[ 3 ] = { { start.x, start.y }, { end.x, end.y }, { end.x, start.y } };
Polygon( hdc, point, 3 );
}
break;
case 4:
{
POINT point[ 3 ] = { { start.x, start.y }, { end.x, end.y }, { end.x, start.y } };
Polygon( hdc, point, 3 );
}
break;
default:
return;
}
ReleaseDC( hwnd, hdc );
}
int ChooseShape( POINT & cursor, int shape, RECT & cr )
{
int Shape = shape;
if(( cursor.x >=( cr.right - 85 ) ) &&( cursor.x <=( cr.right - 60 ) ) &&( cursor.y >= 395 ) &&( cursor.y <= 420 ) )
Shape = 1;
else if(( cursor.x >=( cr.right - 85 ) ) &&( cursor.x <=( cr.right - 60 ) ) &&( cursor.y >= 435 ) &&( cursor.y <= 460 ) )
Shape = 2;
else if(( cursor.x >=( cr.right - 40 ) ) &&( cursor.x <=( cr.right - 15 ) ) &&( cursor.y >= 395 ) &&( cursor.y <= 420 ) )
Shape = 3;
else if(( cursor.x >=( cr.right - 40 ) ) &&( cursor.x <=( cr.right - 15 ) ) &&( cursor.y >= 435 ) &&( cursor.y <= 460 ) )
Shape = 4;
return Shape;
}
int PickColor( POINT & cursor, int color, RECT & cr )
{
enum colors { black, gray, darkred, red, darkgreen, green,
darkyellow, yellow, darkblue, blue, purple, pink,
seal, lightblue, darkgray, white };
int Color = color;
for( int i = 0; i < 16; i++ )
{
if(( cursor.x >=( cr.right - 85 ) ) &&( cursor.x <=( cr.right - 60 ) ) &&( cursor.y >=( 20 * i + 25 ) ) &&( cursor.y <=( 20 * i + cr.top ) ) )
Color = i++;
if(( cursor.x >=( cr.right - 40 ) ) &&( cursor.x <=( cr.right - 15 ) ) &&( cursor.y >=( 20 * i + 25 ) ) &&( cursor.y <=( 20 * i + cr.top ) ) )
Color = i;
}
return Color;
}
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