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120 lines
3.6 KiB
Markdown
120 lines
3.6 KiB
Markdown
## Portable File Dialogs documentation
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The library can be used either as a [header-only library](https://en.wikipedia.org/wiki/Header-only),
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or as a [single file library](https://github.com/nothings/single_file_libs).
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### Use as header-only library
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Just include the main header file wherever needed:
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```cpp
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#include "portable-file-dialogs.h"
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/* ... */
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pfd::message::message("Hello", "This is a test");
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/* ... */
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```
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### Use as a single-file library
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Defining the `PFD_SKIP_IMPLEMENTATION` macro before including `portable-file-dialogs.h` will
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skip all the implementation code and reduce compilation times. You still need to include the
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header without the macro at least once, typically in a `pfd-impl.cpp` file.
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```cpp
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// In pfd-impl.cpp
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#include "portable-file-dialogs.h"
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```
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```cpp
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// In all other files
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#define PFD_SKIP_IMPLEMENTATION 1
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#include "portable-file-dialogs.h"
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```
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### General concepts
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Dialogs inherit from `pfd::dialog` and are created by calling their class constructor. Their
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destructor will block until the window is closed by user interaction. So for instance this
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will block until the end of the line:
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```cpp
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pfd::message::message("Hi", "there");
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```
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Whereas this will only block until the end of the scope, allowing the program to perform
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additional operations while the dialog is open:
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```cpp
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{
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auto m = pfd::message::message("Hi", "there");
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// ... perform asynchronous operations here
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}
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```
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It is possible to call `bool pfd::dialog::ready(timeout)` on the dialog in order to query its
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status and perform asynchronous operations as long as the user has not interacted:
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```cpp
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{
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auto m = pfd::message::message("Hi", "there");
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while (!m.ready())
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{
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// ... perform asynchronous operations here
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}
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}
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```
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If necessary, a dialog can be forcibly closed using `bool pfd::dialog::kill()`. Note that this
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may be confusing to the user and should only be used in very specific situations. It is also not
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possible to close a Windows message box that provides no _Cancel_ button.
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```cpp
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{
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auto m = pfd::message::message("Hi", "there");
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while (!m.ready())
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{
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// ... perform asynchronous operations here
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if (too_much_time_has_passed())
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m.kill();
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}
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}
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```
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Finally, the user response can be retrieved using `pfd::dialog::result()`. The return value of
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this function depends on which dialog is being used. See their respective documentation for more
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information:
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* [`pfd::message`](message.md) (message box)
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* [`pfd::notify`](notify.md) (notification)
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* [`pfd::open_file`](open_file.md) (file open)
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* [`pfd::save_file`](save_file.md) (file save)
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* [`pfd::select_folder`](select_folder.md) (folder selection)
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### Settings
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The library can be queried and configured through the `pfd::settings` class.
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```cpp
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bool pfd::settings::available();
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void pfd::settings::verbose(bool value);
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void pfd::settings::rescan();
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```
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The return value of `pfd::settings::available()` indicates whether a suitable dialog backend (such
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as Zenity or KDialog on Linux) has been found. If not, the library will not work and all dialog
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invocations will be no-ops. The program will not crash but you should account for this situation
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and add a fallback mechanism or exit gracefully.
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Calling `pfd::settings::rescan()` will force a rescan of available backends. This may change the
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result of `pfd::settings::available()` if a backend was installed on the system in the meantime.
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This is probably only useful for debugging purposes.
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Calling `pfd::settings::verbose(true)` may help debug the library. It will output debug information
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to `std::cout` about some operations being performed.
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