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