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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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72
data/gtk/image_page.ui
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@ -57,45 +57,49 @@
</object>
</child>
<child>
<object class="LpImage" id="image">
<child>
<object class="GtkGestureClick" id="click_gesture">
<property name="button">3</property>
</object>
</child>
<child>
<object class="GtkGestureLongPress" id="press_gesture">
<property name="touch-only">True</property>
</object>
</child>
<child>
<object class="GtkPopoverMenu" id="popover">
<property name="has-arrow">False</property>
<property name="menu-model">image_menu</property>
<child type="rotate-left">
<object class="GtkButton">
<property name="icon-name">object-rotate-left-symbolic</property>
<property name="tooltip-text" translatable="yes">Rotate Left</property>
<property name="action-name">win.rotate</property>
<property name="action-target">-90.0</property>
<style>
<class name="flat" />
</style>
<object class="GtkScrolledWindow" id="scrolled_window">
<property name="child">
<object class="LpImage" id="image">
<child>
<object class="GtkGestureClick" id="click_gesture">
<property name="button">3</property>
</object>
</child>
<child type="rotate-right">
<object class="GtkButton">
<property name="icon-name">object-rotate-right-symbolic</property>
<property name="tooltip-text" translatable="yes">Rotate Right</property>
<property name="action-name">win.rotate</property>
<property name="action-target">90.0</property>
<style>
<class name="flat" />
</style>
<child>
<object class="GtkGestureLongPress" id="press_gesture">
<property name="touch-only">True</property>
</object>
</child>
<child>
<object class="GtkPopoverMenu" id="popover">
<property name="has-arrow">False</property>
<property name="menu-model">image_menu</property>
<child type="rotate-left">
<object class="GtkButton">
<property name="icon-name">object-rotate-left-symbolic</property>
<property name="tooltip-text" translatable="yes">Rotate Left</property>
<property name="action-name">win.rotate</property>
<property name="action-target">-90.0</property>
<style>
<class name="flat" />
</style>
</object>
</child>
<child type="rotate-right">
<object class="GtkButton">
<property name="icon-name">object-rotate-right-symbolic</property>
<property name="tooltip-text" translatable="yes">Rotate Right</property>
<property name="action-name">win.rotate</property>
<property name="action-target">90.0</property>
<style>
<class name="flat" />
</style>
</object>
</child>
</object>
</child>
</object>
</child>
</property>
</object>
</child>
</object>