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tdenetwork/krdc/kremoteview.h

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