/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- * * The contents of this file are subject to the Netscape Public License * Version 1.0 (the "NPL"); you may not use this file except in * compliance with the NPL. You may obtain a copy of the NPL at * http://www.mozilla.org/NPL/ * * Software distributed under the NPL is distributed on an "AS IS" basis, * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the NPL * for the specific language governing rights and limitations under the * NPL. * * The Initial Developer of this code under the NPL is Netscape * Communications Corporation. Portions created by Netscape are * Copyright (C) 1998 Netscape Communications Corporation. All Rights * Reserved. */ #ifndef nsIWidget_h__ #define nsIWidget_h__ #include "nsISupports.h" #include "nsColor.h" #include "nsIMouseListener.h" #include "nsIImage.h" #include "prthread.h" #include "nsGUIEvent.h" // forward declarations class nsIToolkit; class nsIFontMetrics; class nsIToolkit; class nsIRenderingContext; class nsIEnumerator; class nsIDeviceContext; class nsIPresContext; struct nsRect; struct nsFont; /** * Callback function that deals with events. * The argument is actually a subtype (subclass) of nsEvent which carries * platform specific information about the event. Platform specific code knows * how to deal with it. * The return value determines whether or not the default action should take place. */ typedef nsEventStatus (*PR_CALLBACK EVENT_CALLBACK)(nsGUIEvent *event); /** * Flags for the getNativeData function. * @see getNativeData() */ #define NS_NATIVE_WINDOW 0 #define NS_NATIVE_GRAPHIC 1 #define NS_NATIVE_COLORMAP 2 // {18032AD5-B265-11d1-AA2A-000000000000} #define NS_IWIDGET_IID \ { 0x18032ad5, 0xb265, 0x11d1, \ { 0xaa, 0x2a, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0 } } // Hide the native window systems real window type so as to avoid // including native window system types and api's. This is necessary // to ensure cross-platform code. typedef void* nsNativeWindow; /** * Cursor types. * eCursor_standard (normal cursor, usually rendered as an arrow) * eCursor_wait (system is busy, usually rendered as a hourglass or watch) * eCursor_select (Selecting something, usually rendered as an IBeam) * eCursor_hyperlink (can hyper-link, usually rendered as a human hand) */ enum nsCursor { eCursor_standard, eCursor_wait, eCursor_select, eCursor_hyperlink }; /** * The base class for all the widgets. It provides the interface for all basic and * necessary functionality. */ class nsIWidget : public nsISupports { public: /** * Create and initialize a widget. * * The widget represents a window that can be drawn into. It also is the * base class for user-interface widgets such as buttons and text boxes. * * All the arguments can be NULL in which case * a top level window with size 0 is created. The event callback function has to * be provided only if the caller wants to deal with the events this widget receives. * The event callback is basically a preprocess hook called synchronously. The return * value determines whether the event goes to the default window procedure or it is * hidden to the os. The assumption is that if the event handler returns false the * widget does not see the event. * * @param parent or null if it's a top level window * @param aRect the widget dimension * @param aHandleEventFunction the event handler callback function * */ virtual void Create(nsIWidget *aParent, const nsRect &aRect, EVENT_CALLBACK aHandleEventFunction, nsIDeviceContext *aContext, nsIToolkit *aToolkit = nsnull) = 0; /** * Create and initialize a widget with a native window parent * * The widget represents a window that can be drawn into. It also is the * base class for user-interface widgets such as buttons and text boxes. * * All the arguments can be NULL in which case * a top level window with size 0 is created. The event callback function has to * be provided only if the caller wants to deal with the events this widget receives. * The event callback is basically a preprocess hook called synchronously. The return * value determines whether the event goes to the default window procedure or it is * hidden to the os. The assumption is that if the event handler returns false the * widget does not see the event. * * @param aParent native window. * @param aRect the widget dimension * @param aHandleEventFunction the event handler callback function * */ virtual void Create(nsNativeWindow aParent, const nsRect &aRect, EVENT_CALLBACK aHandleEventFunction, nsIDeviceContext *aContext, nsIToolkit *aToolkit = nsnull) = 0; /** * Close and destroy the internal native window. * This method does not delete the widget. */ virtual void Destroy(void) = 0; /** * Return the parent Widget of this Widget or nsnull if this is a * top level window * * @return the parent widget or nsnull if it does not have a parent * */ virtual nsIWidget* GetParent(void) = 0; /** * Return an nsEnumerator over the children of this widget. * * @return an enumerator over the list of children or nsnull if it does not * have any children * */ virtual nsIEnumerator* GetChildren(void) = 0; /** * Show or hide this widget * * @param aState PR_TRUE to show the Widget, PR_FALSE to hide it * */ virtual void Show(PRBool aState) = 0; /** * Move this widget. * * @param aX the new x position expressed in the parent's coordinate system * @param aY the new y position expressed in the parent's coordinate system * **/ virtual void Move(PRUint32 aX, PRUint32 aY) = 0; /** * Resize this widget. * * @param aWidth the new width expressed in the parent's coordinate system * @param aHeight the new height expressed in the parent's coordinate system * */ virtual void Resize(PRUint32 aWidth, PRUint32 aHeight) = 0; /** * Move or resize this widget. * * @param aX the new x position expressed in the parent's coordinate system * @param aY the new y position expressed in the parent's coordinate system * @param aWidth the new width expressed in the parent's coordinate system * @param aHeight the new height expressed in the parent's coordinate system * */ virtual void Resize(PRUint32 aX, PRUint32 aY, PRUint32 aWidth, PRUint32 aHeight) = 0; /** * Enable or disable this Widget * * @param aState PR_TRUE to enable the Widget, PR_FALSE to disable it. * */ virtual void Enable(PRBool aState) = 0; /** * Give focus to this widget. */ virtual void SetFocus(void) = 0; /** * Get this widget's dimension * * @param aRect on return it holds the x. y, width and height of this widget * */ virtual void GetBounds(nsRect &aRect) = 0; /** * Get the foreground color for this widget * * @return this widget's foreground color * */ virtual nscolor GetForegroundColor(void) = 0; /** * Set the foreground color for this widget * * @param aColor the new foreground color * */ virtual void SetForegroundColor(const nscolor &aColor) = 0; /** * Get the background color for this widget * * @return this widget's background color * */ virtual nscolor GetBackgroundColor(void) = 0; /** * Set the background color for this widget * * @param aColor the new background color * */ virtual void SetBackgroundColor(const nscolor &aColor) = 0; /** * Get the font for this widget * * @return the font metrics */ virtual nsIFontMetrics* GetFont(void) = 0; /** * Set the font for this widget * * @param aFont font to display. @see nsFont for allowable fonts */ virtual void SetFont(const nsFont &aFont) = 0; /** * Get the cursor for this widget. * * @return this widget's cursor. */ virtual nsCursor GetCursor(void) = 0; /** * Set the cursor for this widget * * @aCursor the new cursor for this widget */ virtual void SetCursor(nsCursor aCursor) = 0; /** * Invalidate the widget and repaint it. * * @param aIsSynchronouse PR_TRUE then repaint synchronously. If PR_FALSE repaint later. * */ virtual void Invalidate(PRBool aIsSynchronous) = 0; /** * Adds a mouse listener to this widget * Any existing mouse listener is replaced * * @param aListener mouse listener to add to this widget. */ virtual void AddMouseListener(nsIMouseListener * aListener) = 0; /** * Return the widget's toolkit * * @return the toolkit this widget was created in. @see nsToolkit. */ virtual nsIToolkit* GetToolkit() = 0; /** * Set the color map for this widget * * @param aColorMap color map for displaying this widget * */ virtual void SetColorMap(nsColorMap *aColorMap) = 0; /** * Scroll this widget. * * @param aDx amount to scroll along the x-axis * @param aDy amount to scroll along the y-axis. * @param aClipRect clipping rectangle to limit the scroll to. * */ virtual void Scroll(PRInt32 aDx, PRInt32 aDy, nsRect *aClipRect) = 0; /* * Internal methods */ /** * Internal Method */ virtual void AddChild(nsIWidget* aChild) = 0; /** * Internal Method */ virtual void RemoveChild(nsIWidget* aChild) = 0; /** * Internal Method */ virtual void* GetNativeData(PRUint32 aDataType) = 0; /** * Internal Method */ virtual nsIRenderingContext* GetRenderingContext() = 0; /** * Internal Method */ virtual nsIDeviceContext* GetDeviceContext() = 0; }; #endif // nsIWidget_h__