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LibGUI: Add optional placeholder to TextEditor

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This lets you show some disabled text when no text is entered, and the
editor is not focused.
This commit is contained in:
Peter Elliott 2020-09-20 12:20:24 -07:00 • committed by Andreas Kling
parent 5b6ccbb918
commit fa96e57c15
Notes: sideshowbarker 2024-07-19 02:18:01 +09:00
4 changed files with 19 additions and 1 deletions
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5
Libraries/LibGUI/TextDocument.cpp
View file

@ -675,6 +675,11 @@ void TextDocument::remove(const TextRange& unnormalized_range)
notify_did_change();
}
bool TextDocument::is_empty() const
{
return line_count() == 1 && line(0).is_empty();
}
TextRange TextDocument::range_for_entire_line(size_t line_index) const
{
if (line_index >= line_count())

3
Libraries/LibGUI/TextDocument.h
View file

@ -139,6 +139,8 @@ public:
virtual bool is_code_document() const { return false; }
bool is_empty() const;
protected:
explicit TextDocument(Client* client);
@ -179,6 +181,7 @@ public:
size_t first_non_whitespace_column() const;
Optional<size_t> last_non_whitespace_column() const;
bool ends_in_whitespace() const;
bool is_empty() const { return length() == 0; }
private:
// NOTE: This vector is null terminated.

7
Libraries/LibGUI/TextEditor.cpp
View file

@ -461,7 +461,12 @@ void TextEditor::paint_event(PaintEvent& event)
#ifdef DEBUG_TEXTEDITOR
painter.draw_rect(visual_line_rect, Color::Cyan);
#endif
if (!document().has_spans()) {
if (!placeholder().is_empty() && document().is_empty() && !is_focused() && line_index == 0) {
auto line_rect = visual_line_rect;
line_rect.set_width(font().width(placeholder()));
painter.draw_text(line_rect, placeholder(), m_text_alignment, palette().color(Gfx::ColorRole::DisabledText));
} else if (!document().has_spans()) {
// Fast-path for plain text
auto color = palette().color(is_enabled() ? foreground_role() : Gfx::ColorRole::DisabledText);
if (is_displayonly() && (is_focused() || has_visible_list()))

5
Libraries/LibGUI/TextEditor.h
View file

@ -60,6 +60,9 @@ public:
virtual void set_document(TextDocument&);
const String& placeholder() const { return m_placeholder; }
void set_placeholder(const StringView& placeholder) { m_placeholder = placeholder; }
void set_visualize_trailing_whitespace(bool);
bool visualize_trailing_whitespace() const { return m_visualize_trailing_whitespace; }
@ -301,6 +304,8 @@ private:
RefPtr<TextDocument> m_document;
String m_placeholder { "" };
template<typename Callback>
void for_each_visual_line(size_t line_index, Callback) const;