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A lightweight image viewer with three display modes: single, spread, and continuous.

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ParaPara
================================================================================

Description
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_ParaPara_ is an image viewer created with lightweight and high-speed operation in mind.

It is supposed to be linked to the extension and opened by double-clicking from your
favorite file manager.

By displaying the two images on the left and right,
you can also see manga in a two-page spread.
You can switch between right-to-left and left-to-right page turning.

Flatpak builds
--------------

You can install stable builds of _ParaPara_ from [Flathub](https://flathub.org)
by using this command:

flatpak remote-add --if-not-exists flathub https://flathub.org/repo/flathub.flatpakrepo
    flatpak install flathub com.github.aharotias2.parapara

Screenshot
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![Screenshot 1](https://raw.githubusercontent.com/aharotias2/parapara/master/docs/images/screenshot-parapara-single-01.png "Single Image View")

Spread display is also possible.

![Screenshot 2](https://raw.githubusercontent.com/aharotias2/parapara/master/docs/images/screenshot-parapara-spread-01.png "Dual Image View")

continuous mode (vertical).

![Screenshot 3](https://raw.githubusercontent.com/aharotias2/parapara/master/docs/images/screenshot-parapara-continuous-01.png "Scrolling Image View (vertical)")

continuous mode (horizontal).

![Screenshot 4](https://raw.githubusercontent.com/aharotias2/parapara/master/docs/images/screenshot-parapara-continuous-02.png "Scrolling Image View (horizontal)")

Key Combinations
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### General key combinations.

+ _Ctrl + N_  
  Open new window.
+ _Ctrl + W_  
  Close this window.
+ _Ctrl + Q_  
  Close all windows and quit this application.
+ _Ctrl + O_  
  Choose an image on your file system and open it.
+ _← (left arrow key)_  
  go backward (if the sort order is ascending)  
  go forward (if the sort order is descending)
+ _→ (right arrow key)_  
  go forward (if the sort order is ascending)  
  go backward (if the sort order is descending)

### Shortcut key in single view mode

+ _Ctrl + S_  
  Save this picture.
+ _Ctrl + Shift + S_  
  Save this picture as another name.
+ _Ctrl + 0_  
  Show this picture as original size
+ _Ctrl + 1_  
  Show this picture as fitting this window.
+ _Ctrl + +_  
  Zoom in
+ _Ctrl + -_  
  Zoom out
+ _Ctrl + H_  
  Invert horizontally
+ _Ctrl + V_  
  Invert vertically
+ _Ctrl + R_  
  Rotate 90 degrees clockwise
+ _Ctrl + L_  
  Rotate 90 degrees counterclockwise
+ _Ctrl + E_  
  Resize this picture. You can save it later.

### Buttons in dual view mode

+ ![2<](https://raw.githubusercontent.com/aharotias2/parapara/master/data/icons/symbolic/move-two-page-left-symbolic.svg)  
  Move two page to the left.
+ ![1<](https://raw.githubusercontent.com/aharotias2/parapara/master/data/icons/symbolic/move-one-page-left-symbolic.svg)  
  Move one page to the left.
+ ![>1](https://raw.githubusercontent.com/aharotias2/parapara/master/data/icons/symbolic/move-one-page-right-symbolic.svg)  
  Move one page to the right
+ ![>2](https://raw.githubusercontent.com/aharotias2/parapara/master/data/icons/symbolic/move-two-page-right-symbolic.svg)  
  Move two page to the right
+ ![2<<1](https://raw.githubusercontent.com/aharotias2/parapara/master/data/icons/symbolic/read-right-to-left-symbolic.svg)  
  Switch "from right to left" reading.
+ ![1>>2](https://raw.githubusercontent.com/aharotias2/parapara/master/data/icons/symbolic/read-left-to-right-symbolic.svg)  
  Switch "from left to right" reading.

Building and Installation
--------------------------------------------------------------------------------

You'll need the following dependencies:

* GCC
* Python3
* Meson build system
* GTK+3 _(in Ubuntu, install libgtk-3-dev)_
* Vala compiler _(0.40 or later)_
* Gee (libgee-0.8 or later) _(in Ubuntu install libgee-0.8-dev)_
* Granite _(in Ubuntu install libgranite-dev)_

Run `meson build` to configure the build environment.
Add the build option `-DDEBUG=true` to log debug messages to a file.
Change to the build directory and run `ninja` to build

meson build --prefix=/usr
    cd build
    ninja

To install, use `ninja install`, then execute with `com.github.aharotias2.parapara`

ninja install
    com.github.aharotias2.parapara

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