2 * Smart "snapping" for window moving and sizing
4 * Author: Alessandro Scotti (Dec 2005)
6 * ------------------------------------------------------------------------
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License as published by
9 * the Free Software Foundation; either version 2 of the License, or
10 * (at your option) any later version.
12 * This program is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 * GNU General Public License for more details.
17 * You should have received a copy of the GNU General Public License
18 * along with this program; if not, write to the Free Software
19 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
20 * ------------------------------------------------------------------------
24 /* Imports from winboard.c */
25 extern HINSTANCE hInst;
28 extern HWND moveHistoryDialog;
29 extern HWND evalGraphDialog;
30 extern HWND engineOutputDialog;
31 extern HWND gameListDialog;
33 static BOOL SnappingEnabled = TRUE;
35 static void AddSnapPoint( int * grid, int * grid_len, int value )
39 if( len < MAX_SNAP_POINTS ) {
42 for( i=0; i<len; i++ ) {
43 if( grid[i] == value ) {
48 grid[ len++ ] = value;
54 static void AddSnapRectangle( SnapData * sd, RECT * rc )
56 AddSnapPoint( sd->x_grid, &sd->x_grid_len, rc->left );
57 AddSnapPoint( sd->x_grid, &sd->x_grid_len, rc->right );
59 AddSnapPoint( sd->y_grid, &sd->y_grid_len, rc->top );
60 AddSnapPoint( sd->y_grid, &sd->y_grid_len, rc->bottom );
63 static void AddSnapWindow( HWND hWndCaller, SnapData * sd, HWND hWndSnapWindow )
65 if( hWndSnapWindow != NULL && hWndCaller != hWndSnapWindow && IsWindowVisible(hWndSnapWindow) ) {
68 GetWindowRect( hWndSnapWindow, &rc );
70 AddSnapRectangle( sd, &rc );
74 static BOOL AdjustToSnapPoint( int * grid, int grid_len, int value, int * snap_size, int * delta )
79 for( i=0; i<grid_len; i++ ) {
80 int distance = value - grid[i];
82 if( distance < 0 ) distance = -distance;
84 if( distance < *snap_size ) {
86 *snap_size = distance;
87 *delta = grid[i] - value;
94 LRESULT OnEnterSizeMove( SnapData * snapData, HWND hWnd, WPARAM wParam, LPARAM lParam )
98 snapData->x_grid_len = 0;
99 snapData->y_grid_len = 0;
101 /* Add desktop area */
102 if( SystemParametersInfo( SPI_GETWORKAREA, 0, &rc, 0 ) ) {
103 AddSnapRectangle( snapData, &rc );
106 if( hWnd != hwndMain ) {
107 /* Add other windows */
108 AddSnapWindow( hWnd, snapData, hwndMain );
109 AddSnapWindow( hWnd, snapData, moveHistoryDialog );
110 AddSnapWindow( hWnd, snapData, evalGraphDialog );
111 AddSnapWindow( hWnd, snapData, engineOutputDialog );
112 AddSnapWindow( hWnd, snapData, gameListDialog );
118 LRESULT OnMoving( SnapData * snapData, HWND hWnd, WPARAM wParam, LPARAM lParam )
120 LPRECT lprc = (LPRECT) lParam;
123 int snap_size_x = SNAP_DISTANCE;
124 int snap_size_y = SNAP_DISTANCE;
126 if( ! SnappingEnabled ) {
130 AdjustToSnapPoint( snapData->x_grid, snapData->x_grid_len, lprc->left, &snap_size_x, &delta_x );
131 AdjustToSnapPoint( snapData->x_grid, snapData->x_grid_len, lprc->right, &snap_size_x, &delta_x );
133 AdjustToSnapPoint( snapData->y_grid, snapData->y_grid_len, lprc->top, &snap_size_y, &delta_y );
134 AdjustToSnapPoint( snapData->y_grid, snapData->y_grid_len, lprc->bottom, &snap_size_y, &delta_y );
136 OffsetRect( lprc, delta_x, delta_y );
141 LRESULT OnSizing( SnapData * snapData, HWND hWnd, WPARAM wParam, LPARAM lParam )
143 LPRECT lprc = (LPRECT) lParam;
146 int snap_size_x = SNAP_DISTANCE;
147 int snap_size_y = SNAP_DISTANCE;
149 if( ! SnappingEnabled ) {
155 AdjustToSnapPoint( snapData->y_grid, snapData->y_grid_len, lprc->bottom, &snap_size_y, &delta_y );
156 lprc->bottom += delta_y;
158 case WMSZ_BOTTOMLEFT:
159 AdjustToSnapPoint( snapData->y_grid, snapData->y_grid_len, lprc->bottom, &snap_size_y, &delta_y );
160 lprc->bottom += delta_y;
161 AdjustToSnapPoint( snapData->x_grid, snapData->x_grid_len, lprc->left, &snap_size_x, &delta_x );
162 lprc->left += delta_x;
164 case WMSZ_BOTTOMRIGHT:
165 AdjustToSnapPoint( snapData->y_grid, snapData->y_grid_len, lprc->bottom, &snap_size_y, &delta_y );
166 lprc->bottom += delta_y;
167 AdjustToSnapPoint( snapData->x_grid, snapData->x_grid_len, lprc->right, &snap_size_x, &delta_x );
168 lprc->right += delta_x;
171 AdjustToSnapPoint( snapData->x_grid, snapData->x_grid_len, lprc->left, &snap_size_x, &delta_x );
172 lprc->left += delta_x;
175 AdjustToSnapPoint( snapData->x_grid, snapData->x_grid_len, lprc->right, &snap_size_x, &delta_x );
176 lprc->right += delta_x;
179 AdjustToSnapPoint( snapData->y_grid, snapData->y_grid_len, lprc->top, &snap_size_y, &delta_y );
180 lprc->top += delta_y;
183 AdjustToSnapPoint( snapData->y_grid, snapData->y_grid_len, lprc->top, &snap_size_y, &delta_y );
184 lprc->top += delta_y;
185 AdjustToSnapPoint( snapData->x_grid, snapData->x_grid_len, lprc->left, &snap_size_x, &delta_x );
186 lprc->left += delta_x;
189 AdjustToSnapPoint( snapData->y_grid, snapData->y_grid_len, lprc->top, &snap_size_y, &delta_y );
190 lprc->top += delta_y;
191 AdjustToSnapPoint( snapData->x_grid, snapData->x_grid_len, lprc->right, &snap_size_x, &delta_x );
192 lprc->right += delta_x;
201 LRESULT OnExitSizeMove( SnapData * snapData, HWND hWnd, WPARAM wParam, LPARAM lParam )