Mercurial > projects > dwt-linux
view dwt/widgets/Canvas.d @ 322:96b14a31d9b3
Added missing dwthelper.utils imports. (catched by llvmdc)
author | Frank Benoit <benoit@tionex.de> |
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date | Mon, 06 Oct 2008 21:02:12 +0200 |
parents | c0d810de7093 |
children |
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/******************************************************************************* * Copyright (c) 2000, 2008 IBM Corporation and others. * All rights reserved. This program and the accompanying materials * are made available under the terms of the Eclipse Public License v1.0 * which accompanies this distribution, and is available at * http://www.eclipse.org/legal/epl-v10.html * * Contributors: * IBM Corporation - initial API and implementation * Port to the D programming language: * Frank Benoit <benoit@tionex.de> *******************************************************************************/ module dwt.widgets.Canvas; import dwt.dwthelper.utils; import dwt.graphics.Point; import dwt.internal.gtk.OS; import dwt.DWT; import dwt.widgets.Composite; import dwt.widgets.Caret; import dwt.widgets.Control; import dwt.widgets.IME; import dwt.graphics.GC; import dwt.graphics.Rectangle; import dwt.graphics.Font; /** * Instances of this class provide a surface for drawing * arbitrary graphics. * <dl> * <dt><b>Styles:</b></dt> * <dd>(none)</dd> * <dt><b>Events:</b></dt> * <dd>(none)</dd> * </dl> * <p> * This class may be subclassed by custom control implementors * who are building controls that are <em>not</em> constructed * from aggregates of other controls. That is, they are either * painted using DWT graphics calls or are handled by native * methods. * </p> * * @see Composite * @see <a href="http://www.eclipse.org/swt/snippets/#canvas">Canvas snippets</a> * @see <a href="http://www.eclipse.org/swt/examples.php">DWT Example: ControlExample</a> * @see <a href="http://www.eclipse.org/swt/">Sample code and further information</a> */ public class Canvas : Composite { alias Composite.setBounds setBounds; Caret caret; IME ime; this () {} /** * Constructs a new instance of this class given its parent * and a style value describing its behavior and appearance. * <p> * The style value is either one of the style constants defined in * class <code>DWT</code> which is applicable to instances of this * class, or must be built by <em>bitwise OR</em>'ing together * (that is, using the <code>int</code> "|" operator) two or more * of those <code>DWT</code> style constants. The class description * lists the style constants that are applicable to the class. * Style bits are also inherited from superclasses. * </p> * * @param parent a composite control which will be the parent of the new instance (cannot be null) * @param style the style of control to construct * * @exception IllegalArgumentException <ul> * <li>ERROR_NULL_ARGUMENT - if the parent is null</li> * </ul> * @exception DWTException <ul> * <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the parent</li> * </ul> * * @see DWT * @see Widget#checkSubclass * @see Widget#getStyle */ public this (Composite parent, int style) { super (parent, checkStyle (style)); } /** * Fills the interior of the rectangle specified by the arguments, * with the receiver's background. * * @param gc the gc where the rectangle is to be filled * @param x the x coordinate of the rectangle to be filled * @param y the y coordinate of the rectangle to be filled * @param width the width of the rectangle to be filled * @param height the height of the rectangle to be filled * * @exception IllegalArgumentException <ul> * <li>ERROR_NULL_ARGUMENT - if the gc is null</li> * <li>ERROR_INVALID_ARGUMENT - if the gc has been disposed</li> * </ul> * @exception DWTException <ul> * <li>ERROR_WIDGET_DISPOSED - if the receiver has been disposed</li> * <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver</li> * </ul> * * @since 3.2 */ override public void drawBackground (GC gc, int x, int y, int width, int height) { checkWidget (); if (gc is null) error (DWT.ERROR_NULL_ARGUMENT); if (gc.isDisposed ()) error (DWT.ERROR_INVALID_ARGUMENT); super.drawBackground (gc, x, y, width, height); } /** * Returns the caret. * <p> * The caret for the control is automatically hidden * and shown when the control is painted or resized, * when focus is gained or lost and when an the control * is scrolled. To avoid drawing on top of the caret, * the programmer must hide and show the caret when * drawing in the window any other time. * </p> * * @return the caret for the receiver, may be null * * @exception DWTException <ul> * <li>ERROR_WIDGET_DISPOSED - if the receiver has been disposed</li> * <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver</li> * </ul> */ public Caret getCaret () { checkWidget(); return caret; } override Point getIMCaretPos () { if (caret is null) return super.getIMCaretPos (); return new Point (caret.x, caret.y); } /** * Returns the IME. * * @return the IME * * @exception DWTException <ul> * <li>ERROR_WIDGET_DISPOSED - if the receiver has been disposed</li> * <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver</li> * </ul> * * @since 3.4 */ public IME getIME () { checkWidget (); return ime; } override int /*long*/ gtk_button_press_event (GtkWidget* widget, GdkEventButton* event) { if (ime !is null) { auto result = ime.gtk_button_press_event (widget, event); if (result !is 0) return result; } return super.gtk_button_press_event (widget, event); } override int /*long*/ gtk_commit (GtkIMContext* imcontext, char* text) { if (ime !is null) { auto result = ime.gtk_commit (imcontext, text); if (result !is 0) return result; } return super.gtk_commit (imcontext, text); } override int /*long*/ gtk_expose_event (GtkWidget* widget, GdkEventExpose* event) { if ((state & OBSCURED) !is 0) return 0; bool isFocus = caret !is null && caret.isFocusCaret (); if (isFocus) caret.killFocus (); auto result = super.gtk_expose_event (widget, event); if (isFocus) caret.setFocus (); return result; } override int /*long*/ gtk_focus_in_event (GtkWidget* widget, GdkEventFocus* event) { auto result = super.gtk_focus_in_event (widget, event); if (caret !is null) caret.setFocus (); return result; } override int /*long*/ gtk_focus_out_event (GtkWidget* widget, GdkEventFocus* event) { auto result = super.gtk_focus_out_event (widget, event); if (caret !is null) caret.killFocus (); return result; } override int /*long*/ gtk_preedit_changed (GtkIMContext* imcontext) { if (ime !is null) { auto result = ime.gtk_preedit_changed (imcontext); if (result !is 0) return result; } return super.gtk_preedit_changed (imcontext); } override void redrawWidget (int x, int y, int width, int height, bool redrawAll, bool all, bool trim) { bool isFocus = caret !is null && caret.isFocusCaret (); if (isFocus) caret.killFocus (); super.redrawWidget (x, y, width, height, redrawAll, all, trim); if (isFocus) caret.setFocus (); } override void releaseChildren (bool destroy) { if (caret !is null) { caret.release (false); caret = null; } if (ime !is null) { ime.release (false); ime = null; } super.releaseChildren (destroy); } /** * Scrolls a rectangular area of the receiver by first copying * the source area to the destination and then causing the area * of the source which is not covered by the destination to * be repainted. Children that intersect the rectangle are * optionally moved during the operation. In addition, outstanding * paint events are flushed before the source area is copied to * ensure that the contents of the canvas are drawn correctly. * * @param destX the x coordinate of the destination * @param destY the y coordinate of the destination * @param x the x coordinate of the source * @param y the y coordinate of the source * @param width the width of the area * @param height the height of the area * @param all <code>true</code>if children should be scrolled, and <code>false</code> otherwise * * @exception DWTException <ul> * <li>ERROR_WIDGET_DISPOSED - if the receiver has been disposed</li> * <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver</li> * </ul> */ public void scroll (int destX, int destY, int x, int y, int width, int height, bool all) { checkWidget(); if (width <= 0 || height <= 0) return; if ((style & DWT.MIRRORED) !is 0) { int clientWidth = getClientWidth (); x = clientWidth - width - x; destX = clientWidth - width - destX; } int deltaX = destX - x, deltaY = destY - y; if (deltaX is 0 && deltaY is 0) return; if (!isVisible ()) return; bool isFocus = caret !is null && caret.isFocusCaret (); if (isFocus) caret.killFocus (); auto window = paintWindow (); auto visibleRegion = OS.gdk_drawable_get_visible_region (window); GdkRectangle* srcRect = new GdkRectangle (); srcRect.x = x; srcRect.y = y; srcRect.width = width; srcRect.height = height; auto copyRegion = OS.gdk_region_rectangle (srcRect); OS.gdk_region_intersect(copyRegion, visibleRegion); auto invalidateRegion = OS.gdk_region_rectangle (srcRect); OS.gdk_region_subtract (invalidateRegion, visibleRegion); OS.gdk_region_offset (invalidateRegion, deltaX, deltaY); GdkRectangle* copyRect = new GdkRectangle(); OS.gdk_region_get_clipbox (copyRegion, copyRect); if (copyRect.width !is 0 && copyRect.height !is 0) { update (); } Control control = findBackgroundControl (); if (control is null) control = this; if (control.backgroundImage !is null) { redrawWidget (x, y, width, height, false, false, false); redrawWidget (destX, destY, width, height, false, false, false); } else { // GC gc = new GC (this); // gc.copyArea (x, y, width, height, destX, destY); // gc.dispose (); auto gdkGC = OS.gdk_gc_new (window); OS.gdk_gc_set_exposures (gdkGC, true); OS.gdk_draw_drawable (window, gdkGC, window, copyRect.x, copyRect.y, copyRect.x + deltaX, copyRect.y + deltaY, copyRect.width, copyRect.height); OS.g_object_unref (gdkGC); bool disjoint = (destX + width < x) || (x + width < destX) || (destY + height < y) || (y + height < destY); if (disjoint) { GdkRectangle* rect = new GdkRectangle (); rect.x = x; rect.y = y; rect.width = width; rect.height = height; OS.gdk_region_union_with_rect (invalidateRegion, rect); } else { GdkRectangle* rect = new GdkRectangle (); if (deltaX !is 0) { int newX = destX - deltaX; if (deltaX < 0) newX = destX + width; rect.x = newX; rect.y = y; rect.width = Math.abs(deltaX); rect.height = height; OS.gdk_region_union_with_rect (invalidateRegion, rect); } if (deltaY !is 0) { int newY = destY - deltaY; if (deltaY < 0) newY = destY + height; rect.x = x; rect.y = newY; rect.width = width; rect.height = Math.abs(deltaY); OS.gdk_region_union_with_rect (invalidateRegion, rect); } } OS.gdk_window_invalidate_region(window, invalidateRegion, all); OS.gdk_region_destroy (visibleRegion); OS.gdk_region_destroy (copyRegion); OS.gdk_region_destroy (invalidateRegion); } if (all) { Control [] children = _getChildren (); for (int i=0; i<children.length; i++) { Control child = children [i]; Rectangle rect = child.getBounds (); if (Math.min(x + width, rect.x + rect.width) >= Math.max (x, rect.x) && Math.min(y + height, rect.y + rect.height) >= Math.max (y, rect.y)) { child.setLocation (rect.x + deltaX, rect.y + deltaY); } } } if (isFocus) caret.setFocus (); } override int setBounds (int x, int y, int width, int height, bool move, bool resize) { bool isFocus = caret !is null && caret.isFocusCaret (); if (isFocus) caret.killFocus (); int result = super.setBounds (x, y, width, height, move, resize); if (isFocus) caret.setFocus (); return result; } /** * Sets the receiver's caret. * <p> * The caret for the control is automatically hidden * and shown when the control is painted or resized, * when focus is gained or lost and when an the control * is scrolled. To avoid drawing on top of the caret, * the programmer must hide and show the caret when * drawing in the window any other time. * </p> * @param caret the new caret for the receiver, may be null * * @exception IllegalArgumentException <ul> * <li>ERROR_INVALID_ARGUMENT - if the caret has been disposed</li> * </ul> * @exception DWTException <ul> * <li>ERROR_WIDGET_DISPOSED - if the receiver has been disposed</li> * <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver</li> * </ul> */ public void setCaret (Caret caret) { checkWidget(); Caret newCaret = caret; Caret oldCaret = this.caret; this.caret = newCaret; if (hasFocus ()) { if (oldCaret !is null) oldCaret.killFocus (); if (newCaret !is null) { if (newCaret.isDisposed()) error(DWT.ERROR_INVALID_ARGUMENT); newCaret.setFocus (); } } } override public void setFont (Font font) { checkWidget(); if (caret !is null) caret.setFont (font); super.setFont (font); } /** * Sets the receiver's IME. * * @param ime the new IME for the receiver, may be null * * @exception IllegalArgumentException <ul> * <li>ERROR_INVALID_ARGUMENT - if the IME has been disposed</li> * </ul> * @exception DWTException <ul> * <li>ERROR_WIDGET_DISPOSED - if the receiver has been disposed</li> * <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver</li> * </ul> * * @since 3.4 */ public void setIME (IME ime) { checkWidget (); if (ime !is null && ime.isDisposed()) error(DWT.ERROR_INVALID_ARGUMENT); this.ime = ime; } void updateCaret () { auto imHandle = imHandle (); if (imHandle is null) return; GdkRectangle* rect = new GdkRectangle (); rect.x = caret.x; rect.y = caret.y; rect.width = caret.width; rect.height = caret.height; OS.gtk_im_context_set_cursor_location (imHandle, rect); } }