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290 lines
8.6 KiB
290 lines
8.6 KiB
/***************************************************************************
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kremoteview.h - widget that shows the remote framebuffer
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-------------------
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begin : Wed Dec 25 23:58:12 CET 2002
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copyright : (C) 2002-2003 by Tim Jansen
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email : tim@tjansen.de
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***************************************************************************/
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/***************************************************************************
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* *
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* This program is free software; you can redistribute it and/or modify *
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* it under the terms of the GNU General Public License as published by *
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* the Free Software Foundation; either version 2 of the License, or *
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* (at your option) any later version. *
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* *
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***************************************************************************/
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#ifndef KREMOTEVIEW_H
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#define KREMOTEVIEW_H
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#include <qwidget.h>
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#include <kkeynative.h>
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#include "events.h"
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typedef enum {
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QUALITY_UNKNOWN=0,
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QUALITY_HIGH=1,
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QUALITY_MEDIUM=2,
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QUALITY_LOW=3
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} Quality;
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/**
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* Describes the state of a local cursor, if there is such a concept in the backend.
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* With local cursors, there are two cursors: the cursor on the local machine (client),
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* and the cursor on the remote machine (server). Because there is usually some lag,
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* some backends show both cursors simultanously. In the VNC backend the local cursor
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* is a dot and the remote cursor is the 'real' cursor, usually an arrow.
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*/
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enum DotCursorState {
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DOT_CURSOR_ON, ///< Always show local cursor (and the remote one).
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DOT_CURSOR_OFF, ///< Never show local cursor, only the remote one.
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/// Try to measure the lag and enable the local cursor if the latency is too high.
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DOT_CURSOR_AUTO
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};
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/**
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* Generic widget that displays a remote framebuffer.
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* Implement this if you want to add another backend.
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*
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* Things to take care of:
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* @li The KRemoteView is responsible for its size. In
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* non-scaling mode, set the fixed size of the widget
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* to the remote resolution. In scaling mode, set the
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* maximum size to the remote size and minimum size to the
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* smallest resolution that your scaler can handle.
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* @li if you override mouseMoveEvent()
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* you must ignore the QEvent, because the KRDC widget will
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* need it for stuff like toolbar auto-hide and bump
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* scrolling. If you use x11Event(), make sure that
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* MotionNotify events will be forwarded.
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*
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*/
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class KRemoteView : public QWidget
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{
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Q_OBJECT
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public:
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KRemoteView(QWidget *parent = 0,
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const char *name = 0,
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WFlags f = 0);
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virtual ~KRemoteView();
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/**
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* Checks whether the backend supports scaling. The
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* default implementation returns false.
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* @return true if scaling is supported
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* @see scaling()
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*/
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virtual bool supportsScaling() const;
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/**
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* Checks whether the widget is in scale mode. The
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* default implementation always returns false.
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* @return true if scaling is activated. Must always be
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* false if @ref supportsScaling() returns false
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* @see supportsScaling()
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*/
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virtual bool scaling() const;
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/**
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* Checks whether the backend supports the concept of local cursors. The
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* default implementation returns false.
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* @return true if local cursors are supported/known
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* @see DotCursorState
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* @see showDotCursor()
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* @see dotCursorState()
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*/
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virtual bool supportsLocalCursor() const;
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/**
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* Sets the state of the dot cursor, if supported by the backend.
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* The default implementation does nothing.
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* @param state the new state (DOT_CURSOR_ON, DOT_CURSOR_OFF or
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* DOT_CURSOR_AUTO)
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* @see dotCursorState()
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* @see supportsLocalCursor()
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*/
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virtual void showDotCursor(DotCursorState state);
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/**
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* Returns the state of the local cursor. The default implementation returns
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* always DOT_CURSOR_OFF.
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* @return true if local cursors are supported/known
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* @see showDotCursor()
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* @see supportsLocalCursor()
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*/
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virtual DotCursorState dotCursorState() const;
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/**
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* Checks whether the view is in view-only mode. This means
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* that all input is ignored.
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*/
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virtual bool viewOnly() = 0;
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/**
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* Returns the resolution of the remote framebuffer.
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* It should return a null @ref QSize when the size
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* is not known.
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* The backend must also emit a @ref changeSize()
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* when the size of the framebuffer becomes available
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* for the first time or the size changed.
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* @return the remote framebuffer size, a null QSize
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* if unknown
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*/
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virtual QSize framebufferSize() = 0;
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/**
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* Initiate the disconnection. This doesn't need to happen
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* immediately. The call must not block.
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* @see isQuitting()
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*/
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virtual void startQuitting() = 0;
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/**
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* Checks whether the view is currently quitting.
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* @return true if it is quitting
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* @see startQuitting()
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* @see setStatus()
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*/
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virtual bool isQuitting() = 0;
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/**
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* Returns the host the view is connected to.
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* @return the host the view is connected to
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*/
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virtual QString host() = 0;
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/**
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* Returns the port the view is connected to.
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* @return the port the view is connected to
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*/
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virtual int port() = 0;
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/**
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* Initialize the view (for example by showing configuration
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* dialogs to the user) and start connecting. Should not block
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* without running the event loop (so displaying a dialog is ok).
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* When the view starts connecting the application must call
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* @ref setStatus() with the status REMOTE_VIEW_CONNECTING.
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* @return true if successful (so far), false
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* otherwise
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* @see connected()
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* @see disconnected()
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* @see disconnectedError()
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* @see statusChanged()
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*/
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virtual bool start() = 0;
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/**
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* Returns the current status of the connection.
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* @return the status of the connection
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* @see setStatus()
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*/
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enum RemoteViewStatus status();
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public slots:
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/**
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* Called to enable or disable scaling.
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* Ignored if @ref supportsScaling() is false.
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* The default implementation does nothing.
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* @param s true to enable, false to disable.
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* @see supportsScaling()
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* @see scaling()
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*/
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virtual void enableScaling(bool s);
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/**
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* Enables/disables the view-only mode.
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* Ignored if @ref supportsScaling() is false.
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* The default implementation does nothing.
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* @param s true to enable, false to disable.
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* @see supportsScaling()
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* @see viewOnly()
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*/
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virtual void setViewOnly(bool s) = 0;
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/**
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* Called to let the backend know it when
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* we switch from/to fullscreen.
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* @param on true when switching to fullscreen,
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* false when switching from fullscreen.
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*/
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virtual void switchFullscreen(bool on);
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/**
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* Sends a key to the remote server.
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* @param k the key to send
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*/
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virtual void pressKey(XEvent *k) = 0;
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signals:
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/**
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* Emitted when the size of the remote screen changes. Also
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* called when the size is known for the first time.
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* @param x the width of the screen
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* @param y the height of the screen
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*/
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void changeSize(int w, int h);
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/**
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* Emitted when the view connected successfully.
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*/
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void connected();
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/**
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* Emitted when the view disconnected without error.
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*/
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void disconnected();
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/**
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* Emitted when the view disconnected with error.
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*/
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void disconnectedError();
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/**
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* Emitted when the status of the view changed.
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* @param s the new status
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*/
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void statusChanged(RemoteViewStatus s);
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/**
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* Emitted when the password dialog is shown or hidden.
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* @param b true when the dialog is shown, false when it has
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* been hidden
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*/
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void showingPasswordDialog(bool b);
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/**
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* Emitted when the mouse on the remote side has been moved.
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* @param x the new x coordinate
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* @param y the new y coordinate
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* @param buttonMask the mask of mouse buttons (bit 0 for first mouse
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* button, 1 for second button etc)a
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*/
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void mouseStateChanged(int x, int y, int buttonMask);
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protected:
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/**
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* The status of the remote view.
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*/
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enum RemoteViewStatus m_status;
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/**
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* Set the status of the connection.
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* Emits a statusChanged() signal.
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* Note that the states need to be set in a certain order,
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* see @ref RemoteViewStatus. setStatus() will try to do this
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* transition automatically, so if you are in REMOTE_VIEW_CONNECTING
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* and call setStatus(REMOTE_VIEW_PREPARING), setStatus() will
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* emit a REMOTE_VIEW_AUTHENTICATING and then REMOTE_VIEW_PREPARING.
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* If you transition backwards, it will emit a
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* REMOTE_VIEW_DISCONNECTED before doing the transition.
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* @param s the new status
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*/
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virtual void setStatus(RemoteViewStatus s);
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};
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#endif
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