--- /dev/null
+/*
+ * wsnap.c -- Smart "snapping" for window moving and sizing
+ *
+ * Author: Alessandro Scotti
+ *
+ * ------------------------------------------------------------------------
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ * ------------------------------------------------------------------------
+ */
+#include "wsnap.h"
+
+/* Imports from winboard.c */
+extern HINSTANCE hInst;
+
+extern HWND hwndMain;
+extern HWND moveHistoryDialog;
+extern HWND evalGraphDialog;
+extern HWND gameListDialog;
+
+static BOOL SnappingEnabled = TRUE;
+
+static void AddSnapPoint( int * grid, int * grid_len, int value )
+{
+ int len = *grid_len;
+
+ if( len < MAX_SNAP_POINTS ) {
+ int i;
+
+ for( i=0; i<len; i++ ) {
+ if( grid[i] == value ) {
+ return;
+ }
+ }
+
+ grid[ len++ ] = value;
+
+ *grid_len = len;
+ }
+}
+
+static void AddSnapRectangle( SnapData * sd, RECT * rc )
+{
+ AddSnapPoint( sd->x_grid, &sd->x_grid_len, rc->left );
+ AddSnapPoint( sd->x_grid, &sd->x_grid_len, rc->right );
+
+ AddSnapPoint( sd->y_grid, &sd->y_grid_len, rc->top );
+ AddSnapPoint( sd->y_grid, &sd->y_grid_len, rc->bottom );
+}
+
+static void AddSnapWindow( HWND hWndCaller, SnapData * sd, HWND hWndSnapWindow )
+{
+ if( hWndSnapWindow != NULL && hWndCaller != hWndSnapWindow && IsWindowVisible(hWndSnapWindow) ) {
+ RECT rc;
+
+ GetWindowRect( hWndSnapWindow, &rc );
+
+ AddSnapRectangle( sd, &rc );
+ }
+}
+
+static BOOL AdjustToSnapPoint( int * grid, int grid_len, int value, int * snap_size, int * delta )
+{
+ BOOL result = FALSE;
+ int i;
+
+ for( i=0; i<grid_len; i++ ) {
+ int distance = value - grid[i];
+
+ if( distance < 0 ) distance = -distance;
+
+ if( distance < *snap_size ) {
+ result = TRUE;
+ *snap_size = distance;
+ *delta = grid[i] - value;
+ }
+ }
+
+ return result;
+}
+
+LRESULT OnEnterSizeMove( SnapData * snapData, HWND hWnd, WPARAM wParam, LPARAM lParam )
+{
+ RECT rc;
+
+ snapData->x_grid_len = 0;
+ snapData->y_grid_len = 0;
+
+ /* Add desktop area */
+ if( SystemParametersInfo( SPI_GETWORKAREA, 0, &rc, 0 ) ) {
+ AddSnapRectangle( snapData, &rc );
+ }
+
+ if( hWnd != hwndMain ) {
+ /* Add other windows */
+ AddSnapWindow( hWnd, snapData, hwndMain );
+ AddSnapWindow( hWnd, snapData, moveHistoryDialog );
+ AddSnapWindow( hWnd, snapData, evalGraphDialog );
+ AddSnapWindow( hWnd, snapData, gameListDialog );
+ }
+
+ return 0;
+}
+
+LRESULT OnMoving( SnapData * snapData, HWND hWnd, WPARAM wParam, LPARAM lParam )
+{
+ LPRECT lprc = (LPRECT) lParam;
+ int delta_x = 0;
+ int delta_y = 0;
+ int snap_size_x = SNAP_DISTANCE;
+ int snap_size_y = SNAP_DISTANCE;
+
+ if( ! SnappingEnabled ) {
+ return FALSE;
+ }
+
+ AdjustToSnapPoint( snapData->x_grid, snapData->x_grid_len, lprc->left, &snap_size_x, &delta_x );
+ AdjustToSnapPoint( snapData->x_grid, snapData->x_grid_len, lprc->right, &snap_size_x, &delta_x );
+
+ AdjustToSnapPoint( snapData->y_grid, snapData->y_grid_len, lprc->top, &snap_size_y, &delta_y );
+ AdjustToSnapPoint( snapData->y_grid, snapData->y_grid_len, lprc->bottom, &snap_size_y, &delta_y );
+
+ OffsetRect( lprc, delta_x, delta_y );
+
+ return TRUE;
+}
+
+LRESULT OnSizing( SnapData * snapData, HWND hWnd, WPARAM wParam, LPARAM lParam )
+{
+ LPRECT lprc = (LPRECT) lParam;
+ int delta_x = 0;
+ int delta_y = 0;
+ int snap_size_x = SNAP_DISTANCE;
+ int snap_size_y = SNAP_DISTANCE;
+
+ if( ! SnappingEnabled ) {
+ return FALSE;
+ }
+
+ switch( wParam ) {
+ case WMSZ_BOTTOM:
+ AdjustToSnapPoint( snapData->y_grid, snapData->y_grid_len, lprc->bottom, &snap_size_y, &delta_y );
+ lprc->bottom += delta_y;
+ break;
+ case WMSZ_BOTTOMLEFT:
+ AdjustToSnapPoint( snapData->y_grid, snapData->y_grid_len, lprc->bottom, &snap_size_y, &delta_y );
+ lprc->bottom += delta_y;
+ AdjustToSnapPoint( snapData->x_grid, snapData->x_grid_len, lprc->left, &snap_size_x, &delta_x );
+ lprc->left += delta_x;
+ break;
+ case WMSZ_BOTTOMRIGHT:
+ AdjustToSnapPoint( snapData->y_grid, snapData->y_grid_len, lprc->bottom, &snap_size_y, &delta_y );
+ lprc->bottom += delta_y;
+ AdjustToSnapPoint( snapData->x_grid, snapData->x_grid_len, lprc->right, &snap_size_x, &delta_x );
+ lprc->right += delta_x;
+ break;
+ case WMSZ_LEFT:
+ AdjustToSnapPoint( snapData->x_grid, snapData->x_grid_len, lprc->left, &snap_size_x, &delta_x );
+ lprc->left += delta_x;
+ break;
+ case WMSZ_RIGHT:
+ AdjustToSnapPoint( snapData->x_grid, snapData->x_grid_len, lprc->right, &snap_size_x, &delta_x );
+ lprc->right += delta_x;
+ break;
+ case WMSZ_TOP:
+ AdjustToSnapPoint( snapData->y_grid, snapData->y_grid_len, lprc->top, &snap_size_y, &delta_y );
+ lprc->top += delta_y;
+ break;
+ case WMSZ_TOPLEFT:
+ AdjustToSnapPoint( snapData->y_grid, snapData->y_grid_len, lprc->top, &snap_size_y, &delta_y );
+ lprc->top += delta_y;
+ AdjustToSnapPoint( snapData->x_grid, snapData->x_grid_len, lprc->left, &snap_size_x, &delta_x );
+ lprc->left += delta_x;
+ break;
+ case WMSZ_TOPRIGHT:
+ AdjustToSnapPoint( snapData->y_grid, snapData->y_grid_len, lprc->top, &snap_size_y, &delta_y );
+ lprc->top += delta_y;
+ AdjustToSnapPoint( snapData->x_grid, snapData->x_grid_len, lprc->right, &snap_size_x, &delta_x );
+ lprc->right += delta_x;
+ break;
+ default:
+ return FALSE;
+ }
+
+ return TRUE;
+}
+
+LRESULT OnExitSizeMove( SnapData * snapData, HWND hWnd, WPARAM wParam, LPARAM lParam )
+{
+ return 0;
+}
projects / xboard.git / blobdiff