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image: Add zoom and scrolling support

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Zoom via
- Scroll event controller
- Zoom gesture
- Overlay buttons
- Fixed zoom level shortcuts (1=100%, 2=200%)
Scrolling via
- Scrolled window
- Drag gesture
Changes
- Implement best-fit via calculating a zoom level
- Gesture for carousel no longer working because of scrolled window
- Split control overlays into two to not steal inputs in area between

Closes #17
This commit is contained in:
Sophie Herold 2022-11-10 19:39:23 +01:00
parent 73a1702c47
commit 029c0c9244
9 changed files with 952 additions and 155 deletions
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12
data/gtk/help_overlay.ui
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@ -38,6 +38,18 @@
<property name="accelerator">&lt;Primary&gt;q</property>
</object>
</child>
<child>
<object class="GtkShortcutsShortcut">
<property name="title" translatable="yes" context="shortcut window">Show with orginal scale</property>
<property name="accelerator">1</property>
</object>
</child>
<child>
<object class="GtkShortcutsShortcut">
<property name="title" translatable="yes" context="shortcut window">Show with 200% of orginal scale</property>
<property name="accelerator">2</property>
</object>
</child>
</object>
</child>
</object>