khtml/imload/updater.h

   1 /*
   2     Large image displaying library.
   3
   4     Copyright (C) 2004 Maks Orlovich (maksim@kde.org)
   5
   6     Permission is hereby granted, free of charge, to any person obtaining a copy
   7     of this software and associated documentation files (the "Software"), to deal
   8     in the Software without restriction, including without limitation the rights
   9     to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
  10     copies of the Software, and to permit persons to whom the Software is
  11     furnished to do so, subject to the following conditions:
  12
  13     The above copyright notice and this permission notice shall be included in
  14     all copies or substantial portions of the Software.
  15
  16     THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  17     IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  18     FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL THE
  19     AUTHORS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
  20     AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
  21     CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  22
  23 */
  24
  25 #ifndef UPDATER_H
  26 #define UPDATER_H
  27
  28 #include <QObject>
  29 #include <QVector>
  30
  31 class QTimer;
  32
  33 namespace khtmlImLoad {
  34
  35 class Image;
  36
  37 /**
  38  The updater class helps manage timers, to permit update messages to be coalesced (so we don't
  39  bug KHTML, or whatever use every 5 pico-seconds.
  40 */
  41 class Updater: public QObject
  42 {
  43     Q_OBJECT
  44 public:
  45     Updater();
  46
  47     /**
  48      The frames should call this function as they start having data to emit.
  49      The updater will call back their notifyPerformUpdate() function when a sufficient
  50      amount of time has passed.
  51      */
  52     void haveUpdates(Image* frame);
  53
  54     /**
  55      Called by image when it's destroyed, and hence should be purged
  56      from the updates list
  57     */
  58     void destroyed(Image* frame);
  59
  60 private Q_SLOTS:
  61     void pushUpdates();
  62 private:
  63     QTimer* updatePusher;
  64     bool updatesPending();
  65     QVector<Image*> frames[10];
  66     int             timePortion;
  67 };
  68
  69 }
  70
  71 #endif
  72 // kate: indent-width 4; replace-tabs on; tab-width 4; space-indent on;