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LibGUI: Add glyph substitution to TextEditor

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This patch adds the member variable m_substitution_code_point to
GUI::TextEditor. If non-zero, all gylphs to be drawn will be substituted
with the specified code point. This is mainly needed to support a
PasswordBox.

While the primary use-case is for single-line editors, multi-line
editors are also supported.

To prevent repeated String construction, a m_substitution_string_data
members has been added, which is an OwnPtr<Vector<u32>>. This is used as
a UTF-32 string builder. The substitution_code_point_view method uses
that Vector to provide a Utf32View of the specified length.
This commit is contained in:
Max Wipfli 2021-06-25 17:48:51 +02:00 • committed by Andreas Kling
parent 37961bf7cb
commit de67d86696
2 changed files with 67 additions and 13 deletions
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11
Userland/Libraries/LibGUI/TextEditor.h
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@ -176,6 +176,9 @@ public:
bool should_autocomplete_automatically() const { return m_autocomplete_timer; }
void set_should_autocomplete_automatically(bool);
u32 substitution_code_point() const { return m_substitution_code_point; }
void set_substitution_code_point(u32 code_point);
bool is_in_drag_select() const { return m_in_drag_select; }
TextRange* selection() { return &m_selection; };
@ -274,6 +277,9 @@ private:
TextEditor& m_editor;
};
int text_width_for_font(auto const& text_view, Gfx::Font const&) const;
Utf32View substitution_code_point_view(size_t length) const;
Gfx::IntRect line_content_rect(size_t item_index) const;
Gfx::IntRect line_widget_rect(size_t line_index) const;
void delete_selection();
@ -321,6 +327,11 @@ private:
size_t m_soft_tab_width { 4 };
int m_horizontal_content_padding { 3 };
TextRange m_selection;
// NOTE: If non-zero, all glyphs will be substituted with this one.
u32 m_substitution_code_point { 0 };
mutable OwnPtr<Vector<u32>> m_substitution_string_data; // Used to avoid repeated String construction.
RefPtr<Menu> m_context_menu;
RefPtr<Action> m_undo_action;
RefPtr<Action> m_redo_action;