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KDesktop Design Document
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Author :
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David Faure, faure@kde.org
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Martin R. Jones, mjones@kde.org (screensaver)
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Geert Jansen, g.t.jansen@stud.tue.nl (background code)
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Last modified: 24 Oct 1999
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Overall design of KDesktop :
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=============================
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KDesktop is the program that handles the desktop icons,
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the popup menus for the desktop, the mac menubar, and the
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screensaver system.
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Files :
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=======
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main.* : main
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desktop.* : the icon container for the desktop icons
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krootwm.* : right and middle mouse button popup menus, Mac menubar
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bg*.*: Background renderer/manager.
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icons.* : old code, not used anymore.
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We need to borrow ideas from it for positioning icons after a DnD
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(in kiconcontainer so that it works with konqueror as well)
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- well, only if we want dropped icons to remain where they have been
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dropped :)
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We also need to store the desktop icons position, like was done in kfm.
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and we need to do it for konqy as well.
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KDesktopIface* : DCOP interface for kdesktop, used by kfmclient
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lock* : screen saver/locker
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Libs used by KDesktop
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======================
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kdecore, kdeui, kfile - usual stuff :)
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libkio - I/O stuff, mimetypes, services, registry
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libkonq - properties dialog, templates ("new") menu, dir lister, settings
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Screensaver
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===========
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The screensaver now works in a similar way to xscreensaver, i.e. a driver
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(kdesktop) provides the timeout, locking, and blanking functionality, but
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does no actual drawing. A separate stand-alone program capable of
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drawing on a supplied window is used to do the actual fancy graphics.
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xscreensaver's "hacks" will work with the KDE screensaver engine.
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This makes adding new screensavers trivial, and means one less process that
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must always be running (compared to KDE 1.x).
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The screensaver is controlled via DCOP:
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KScreensaverIface::configure() Reloads the screensaver config from desktoprc.
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KScreensaverIface::lock() Locks the screen immediately.
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KScreensaverIface::save() Saves the screen immediately.
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KScreensaverIface::isEnabled() returns true if the screensaver is enabled.
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KScreensaverIface::isBlanked() returns true if the screen is currently blank.
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Backgrounds
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===========
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The new background code is in bgrender.cpp and bgmanager.cpp. Some features:
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* Support for xearth like programs.
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* Can export a pixmap of the desktop background for pseudo transparency.
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Multiple monitors
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=================
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Two monitors showing different things (not a mirror-setup) can be configured
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in X to either use one X screen, or 2 X screens. Difference is that if I
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drag a window from one monitor to the other the application gets asked to
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repaint itself on a 2 screen setup and a simple move of the window will be
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done in memory (by XFree) if you have a 1 screen setup.
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Monitors example:
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+----+ +-----+ 2 monitors, with same resolution to keep it simple.
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| | | |
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+----+ +-----+
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In case of 1 screen (xinerama)
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+------------+
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| + desktopGeometry == screenGeometry == 3200 x 1200
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+------------+
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In case of 2 screen (multihead)
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+----+ +-----+
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| | | | desktopGeometry = 3200 x 1200
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+----+ +-----+ screenGeometry = 1600 x 1200 (for each monitor)
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