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This directory contains the BitcoinQT graphical user interface (GUI). It uses the cross platform framework [QT](https://www1.qt.io/developers/).
The current precise version for QT 5 is specified in [qt.mk](/depends/packages/qt.mk). QT 4 is also supported (see [#8263](https://github.com/bitcoin/bitcoin/issues/8263)).
## Compile and run
See build instructions ([OSX](/doc/build-osx.md), [Windows](/doc/build-windows.md), [Unix](/doc/build-unix.md), etc).
To run:
```sh
./src/qt/bitcoin-qt
```
## Files and directories
### forms
Contains [Designer UI](http://doc.qt.io/qt-5.9/designer-using-a-ui-file.html) files. They are created with [Qt Creator](#use-qt-Creator-as IDE), but can be edited using any text editor.
### locale
Contains translations. They are periodically updated. The process is described [here](/doc/translation_process.md).
### res
Resources such as the icon.
### test
Tests.
### bitcoingui.(h/cpp)
Represents the main window of the Bitcoin UI.
### \*model.(h/cpp)
The model. When it has a corresponding controller, it generally inherits from [QAbstractTableModel](http://doc.qt.io/qt-5/qabstracttablemodel.html). Models that are used by controllers as helpers inherit from other QT classes like [QValidator](http://doc.qt.io/qt-5/qvalidator.html).
ClientModel is used by the main application `bitcoingui` and several models like `peertablemodel`.
### \*page.(h/cpp)
A controller. `:NAMEpage.cpp` generally includes `:NAMEmodel.h` and `forms/:NAME.page.ui` with a similar `:NAME`.
### \*dialog.(h/cpp)
Various dialogs, e.g. to open a URL. Inherit from [QDialog](http://doc.qt.io/qt-4.8/qdialog.html).
### paymentserver.(h/cpp)
Used to process BIP21 and BIP70 (see https://github.com/bitcoin/bitcoin/pull/11622) payment URI / requests. Also handles URI based application switching (e.g. when following a bitcoin:... link from a browser).
### walletview.(h/cpp)
Represents the view to a single wallet.
### Other .h/cpp files
* UI elements like BitcoinAmountField, which inherit from QWidget.
* `bitcoinstrings.cpp`: automatically generated
* `bitcoinunits.(h/cpp)`: BTC / mBTC / etc handling
* `callback.h`
* `guiconstants.h`: UI colors, app name, etc
* `guiutil.h`: several helper functions
* `macdockiconhandler.(h/cpp)`
* `macdockiconhandler.(h/cpp)`: display notifications in OSX
## Contribute
See [CONTRIBUTING.md](/CONTRIBUTING.md) for general guidelines. Specifically for QT:
* don't change `local/bitcoin_en.ts`; this happens [automatically](/doc/translation_process.md#writing-code-with-translations)
## Using Qt Creator as IDE
You can use Qt Creator as an IDE. This is especially useful if you want to change
the UI layout.
Download and install the community edition of [Qt Creator](https://www.qt.io/download/).
Uncheck everything except Qt Creator during the installation process.
Instructions for OSX:
1. Make sure you installed everything through Homebrew mentioned in the [OSX build instructions](/docs/build-osx.md)
2. Use `./configure` with the `--enable-debug` flag
3. In Qt Creator do "New Project" -> Import Project -> Import Existing Project
4. Enter "bitcoin-qt" as project name, enter src/qt as location
5. Leave the file selection as it is
6. Confirm the "summary page"
7. In the "Projects" tab select "Manage Kits..."
8. Select the default "Desktop" kit and select "Clang (x86 64bit in /usr/bin)" as compiler
9. Select LLDB as debugger (you might need to set the path to your installation)
10. Start debugging with Qt Creator (you might need to the executable to "bitcoin-qt" under "Run", which is where you can also add command line arguments)
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