From 6b40b081b2e29d048284f614fc1e12a1154aa3e3 Mon Sep 17 00:00:00 2001
From: Andreas Kling <awesomekling@gmail.com>
Date: Wed, 8 May 2019 05:00:28 +0200
Subject: [PATCH] GTextEditor: Add a readonly mode.

---
 LibGUI/GTextEditor.cpp | 30 ++++++++++++++++++++++++++----
 LibGUI/GTextEditor.h   |  4 ++++
 2 files changed, 30 insertions(+), 4 deletions(-)

diff --git a/LibGUI/GTextEditor.cpp b/LibGUI/GTextEditor.cpp
index 487a55ba9c..2af1593994 100644
--- a/LibGUI/GTextEditor.cpp
+++ b/LibGUI/GTextEditor.cpp
@@ -112,7 +112,6 @@ GTextPosition GTextEditor::text_position_at(const Point& a_position) const
 
     int line_index = position.y() / line_height();
     line_index = max(0, min(line_index, line_count() - 1));
-    auto& line = *m_lines[line_index];
 
     int column_index;
     switch (m_text_alignment) {
@@ -249,7 +248,6 @@ void GTextEditor::paint_event(GPaintEvent& event)
     painter.translate(-horizontal_scrollbar().value(), -vertical_scrollbar().value());
     if (m_ruler_visible)
         painter.translate(ruler_width(), 0);
-    int exposed_width = max(content_width(), frame_inner_rect().width());
 
     int first_visible_line = text_position_at(event.rect().top_left()).line();
     int last_visible_line = text_position_at(event.rect().bottom_right()).line();
@@ -463,6 +461,8 @@ void GTextEditor::keydown_event(GKeyEvent& event)
     }
 
     if (event.key() == KeyCode::Key_Backspace) {
+        if (is_readonly())
+            return;
         if (has_selection()) {
             delete_selection();
             did_update_selection();
@@ -490,16 +490,20 @@ void GTextEditor::keydown_event(GKeyEvent& event)
     }
 
     if (event.modifiers() == Mod_Shift && event.key() == KeyCode::Key_Delete) {
+        if (is_readonly())
+            return;
         delete_current_line();
         return;
     }
 
     if (event.key() == KeyCode::Key_Delete) {
+        if (is_readonly())
+            return;
         do_delete();
         return;
     }
 
-    if (!event.ctrl() && !event.alt() && !event.text().is_empty())
+    if (!is_readonly() && !event.ctrl() && !event.alt() && !event.text().is_empty())
         insert_at_cursor_or_replace_selection(event.text());
 
     return GWidget::keydown_event(event);
@@ -520,6 +524,9 @@ void GTextEditor::delete_current_line()
 
 void GTextEditor::do_delete()
 {
+    if (is_readonly())
+        return;
+
     if (has_selection())
         return delete_selection();
 
@@ -923,6 +930,7 @@ void GTextEditor::delete_selection()
 
 void GTextEditor::insert_at_cursor_or_replace_selection(const String& text)
 {
+    ASSERT(!is_readonly());
     if (has_selection())
         delete_selection();
     insert_at_cursor(text);
@@ -930,6 +938,8 @@ void GTextEditor::insert_at_cursor_or_replace_selection(const String& text)
 
 void GTextEditor::cut()
 {
+    if (is_readonly())
+        return;
     auto selected_text = this->selected_text();
     printf("Cut: \"%s\"\n", selected_text.characters());
     GClipboard::the().set_data(selected_text);
@@ -945,6 +955,8 @@ void GTextEditor::copy()
 
 void GTextEditor::paste()
 {
+    if (is_readonly())
+        return;
     auto paste_text = GClipboard::the().data();
     printf("Paste: \"%s\"\n", paste_text.characters());
     insert_at_cursor_or_replace_selection(paste_text);
@@ -975,9 +987,19 @@ void GTextEditor::did_change()
     }
 }
 
+void GTextEditor::set_readonly(bool readonly)
+{
+    if (m_readonly == readonly)
+        return;
+    m_readonly = readonly;
+    m_cut_action->set_enabled(!is_readonly() && has_selection());
+    m_delete_action->set_enabled(!is_readonly());
+    m_paste_action->set_enabled(!is_readonly());
+}
+
 void GTextEditor::did_update_selection()
 {
-    m_cut_action->set_enabled(has_selection());
+    m_cut_action->set_enabled(!is_readonly() && has_selection());
     m_copy_action->set_enabled(has_selection());
     if (on_selection_change)
         on_selection_change();
diff --git a/LibGUI/GTextEditor.h b/LibGUI/GTextEditor.h
index b8896f6f51..de01a425cf 100644
--- a/LibGUI/GTextEditor.h
+++ b/LibGUI/GTextEditor.h
@@ -70,6 +70,9 @@ public:
     GTextEditor(Type, GWidget* parent);
     virtual ~GTextEditor() override;
 
+    bool is_readonly() const { return m_readonly; }
+    void set_readonly(bool);
+
     bool is_automatic_indentation() const { return m_automatic_indentation_enabled; }
     void set_automatic_indentation_enabled(bool enabled) { m_automatic_indentation_enabled = enabled; }
 
@@ -196,6 +199,7 @@ private:
     bool m_ruler_visible { false };
     bool m_have_pending_change_notification { false };
     bool m_automatic_indentation_enabled { false };
+    bool m_readonly { false };
     int m_line_spacing { 4 };
     int m_soft_tab_width { 4 };
     int m_horizontal_content_padding { 2 };