mirror of
https://github.com/RGBCube/serenity
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51 lines
2.3 KiB
Markdown
51 lines
2.3 KiB
Markdown
## Name
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clipboard - Data formats specific to Clipboard and drag & drop
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## Clipboard
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The clipboard feature works through the Clipboard server, which generally acts as a global storage or three things:
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- a `String` mime type,
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- a (potentially large) block of data, shared as an anonymous file,
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- a `HashMap<String, String>` of arbitrary metadata, depending on the mime type.
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See also [`Userland/Libraries/LibGUI/Clipboard.h`](../../../../../Userland/Libraries/LibGUI/Clipboard.h).
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## Drag & drop
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In contrast to the clipboard, the drag & drop feature works through WindowServer, and a bouquet of data is transmitted:
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- a `[UTF8] String` to be displayed while dragging,
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- a `HashMap<String, ByteBuffer>` map that contains arbitrary data for a variety of possible mime types,
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- a `Gfx::ShareableBitmap` to be displayed while dragging
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Drag & drop is most prominently supported by File Manager, Spreadsheet, and Terminal.
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Various applications accept drag & drop to open files.
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## glyph/x-fonteditor (Clipboard-only)
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Requires the metadata-fields `count` (count of glyphs copied) and `first_glyph` (lowest codepoint that is copied), encoded as decimal strings.
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The data contains code point (encoded as host-endian `u32`), width and height (as `u8`'s) and glyph bitmap data. It is encoded in width times height many bytes, either 0 (clear) or 1 (set).
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Implemented in `FontEditor::MainWidget::copy_selected_glyphs` and `FontEditor::MainWidget::paste_glyphs`, in [`Userland/Applications/FontEditor/MainWidget.cpp`](../../../../../Userland/Applications/FontEditor/MainWidget.cpp).
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## image/x-serenityos (Clipboard-only)
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Requires the metadata-fields `width`, `height`, `scale`, `format` (see `Gfx::BitmapFormat`), and `pitch`, encoded as decimal strings.
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The data is encoded according to `Gfx::determine_storage_format(BitmapFormat)`, so either as
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`BGRx8888`, `BGRA8888`, `RGBA8888`, or 8-bit palette index. Note that the palette is not transferred.
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Implemented in [`Clipboard::set_bitmap` and `Clipboard::DataAndType::as_bitmap()`](../../../../../Userland/Libraries/LibGUI/Clipboard.cpp).
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## text/uri-list (Clipboard and drag & drop)
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Newline-delimited set of URIs. Used by File Manager, `FileSystemModel`, and Terminal.
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Example:
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```
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file:///home/anon/Desktop/Browser
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file:///home/anon/Desktop/Help
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file:///home/anon/Desktop/Home
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```
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