Shifting of the picture with the arrows keys

src/main/java/org/luwrain/app/viewer/App.java

@@ -29,7 +29,8 @@
 class App implements Application, Pdf.Listener
 {
  static private final float SCALE_STEP = 0.2f;
-
+ static private final double OFFSET_STEP = 200.0;
+
  private Luwrain luwrain = null;
  private Strings strings = null;
  private NavigationArea area = null;
@@ -133,38 +134,33 @@ private void load(String file)
  @Override public void onInputEvent(KeyboardEvent event)
  {
  NullCheck.notNull(event, "event");
-
- if (!event.isSpecial() && !event.isModified())
- switch(event.getChar())
+ if (!event.isSpecial() && !event.isModified())
+ switch(event.getChar())
+ {
+ case '=':
+ {
+ if (pdf == null)
+ return;
+ final float newScale = pdf.getScale() + SCALE_STEP;
+ pdf.setScale(newScale);
+ luwrain.message("Увеличение");
+ return;
+ }
+ case '-':
+ {
+ if (pdf == null)
+ return;
+ final float newScale = pdf.getScale() - SCALE_STEP;
+ if (newScale < 0.5)
  {
- case '=':
- {
- if (pdf == null)
- return;
- final float newScale = pdf.getScale() + SCALE_STEP;
- pdf.setScale(newScale);
- luwrain.message("Увеличение");
- return;
- }
-
- case '-':
- {
- if (pdf == null)
- return;
- final float newScale = pdf.getScale() - SCALE_STEP;
- if (newScale < 0.5)
- {
- luwrain.playSound(Sounds.EVENT_NOT_PROCESSED);
- return;
- }
- pdf.setScale(newScale);
- luwrain.message("Уменьшение");
- return;
- }
-
-
+ luwrain.playSound(Sounds.EVENT_NOT_PROCESSED);
+ return;
  }
-
+ pdf.setScale(newScale);
+ luwrain.message("Уменьшение");
+ return;
+ }
+ }
  if (event.isSpecial() && !event.isModified())
  switch(event.getSpecial())
  {
@@ -196,17 +192,44 @@ private void load(String file)
  luwrain.message("Страница " + (prevPage + 1) + " из " + pdf.getPageCount());//FIXME:
  }
  return;
- case ESCAPE:
- if (pdf != null)
- {
- pdf.close();
- pdf = null;
- closeApp();
- }
+ case ARROW_RIGHT:
+ if (pdf == null)
+ return;
+ if (pdf.setOffsetX(pdf.getOffsetX() + OFFSET_STEP))
+ luwrain.message("Сдвиг вправо"); else //FIXME:
+ luwrain.playSound(Sounds.EVENT_NOT_PROCESSED);
+ return;
+ case ARROW_LEFT:
+ if (pdf == null)
+ return;
+ if (pdf.setOffsetX(pdf.getOffsetX() - OFFSET_STEP))
+ luwrain.message("Сдвиг влево"); else//FIXME:
+ luwrain.playSound(Sounds.EVENT_NOT_PROCESSED);
+ return;
+ case ARROW_UP:
+ if (pdf == null)
  return;
+ if (pdf.setOffsetY(pdf.getOffsetY() - OFFSET_STEP))
+ luwrain.message("Сдвиг вверх"); else //FIXME:
+ luwrain.playSound(Sounds.EVENT_NOT_PROCESSED);
+ return;
+ case ARROW_DOWN:
+ if (pdf == null)
+ return;
+ if (pdf.setOffsetY(pdf.getOffsetY() + OFFSET_STEP))
+ luwrain.message("Сдвиг вниз"); else //FIXME:
+ luwrain.playSound(Sounds.EVENT_NOT_PROCESSED);
+ return;
+ case ESCAPE:
+ if (pdf != null)
+ {
+ pdf.close();
+ pdf = null;
+ closeApp();
  }
- luwrain.message(event.toString());
- // luwrain.playSound(Sounds.EVENT_NOT_PROCESSED);
+ return;
+ }
+ luwrain.playSound(Sounds.EVENT_NOT_PROCESSED);
  }
 
  @Override public void closeApp()