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TextEditor: Add live preview when editing markdown :^)

Browse source 
This works by hooking into the change notifications from the TextEditor
widget and parsing the document content as markdown, and generating an
HTML document from it which is displayed using LibWeb.

This will make it a bit easier to write man pages! :^)
This commit is contained in:
Andreas Kling 2020-04-28 21:42:45 +02:00
parent ea204ef05b
commit 5eaa7ff406
3 changed files with 58 additions and 6 deletions
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53
Applications/TextEditor/TextEditorWidget.cpp
View file

@ -42,12 +42,16 @@
#include <LibGUI/Menu.h>
#include <LibGUI/MenuBar.h>
#include <LibGUI/MessageBox.h>
#include <LibGUI/Splitter.h>
#include <LibGUI/StatusBar.h>
#include <LibGUI/TextBox.h>
#include <LibGUI/TextEditor.h>
#include <LibGUI/ToolBar.h>
#include <LibGUI/ToolBarContainer.h>
#include <LibGfx/Font.h>
#include <LibMarkdown/Document.h>
#include <LibWeb/HtmlView.h>
#include <LibWeb/Parser/HTMLParser.h>
#include <string.h>
TextEditorWidget::TextEditorWidget()
@ -58,12 +62,18 @@ TextEditorWidget::TextEditorWidget()
auto& toolbar_container = add<GUI::ToolBarContainer>();
auto& toolbar = toolbar_container.add<GUI::ToolBar>();
m_editor = add<GUI::TextEditor>();
auto& splitter = add<GUI::HorizontalSplitter>();
m_editor = splitter.add<GUI::TextEditor>();
m_editor->set_ruler_visible(true);
m_editor->set_automatic_indentation_enabled(true);
m_editor->set_line_wrapping_enabled(true);
m_editor->on_change = [this] {
if (m_markdown_preview_enabled)
update_markdown_preview();
// Do not mark as diry on the first change (When document is first opened.)
if (m_document_opening) {
m_document_opening = false;
@ -76,6 +86,9 @@ TextEditorWidget::TextEditorWidget()
update_title();
};
m_html_view = splitter.add<Web::HtmlView>();
m_html_view->set_visible(false);
m_find_replace_widget = add<GUI::Widget>();
m_find_replace_widget->set_fill_with_background_color(true);
m_find_replace_widget->set_size_policy(GUI::SizePolicy::Fill, GUI::SizePolicy::Fixed);
@ -405,9 +418,17 @@ TextEditorWidget::TextEditorWidget()
syntax_actions.add_action(*m_js_highlight);
syntax_menu.add_action(*m_js_highlight);
m_markdown_preview_action = GUI::Action::create_checkable(
"Markdown preview", [this](auto& action) {
set_markdown_preview_enabled(action.is_checked());
},
this);
auto& view_menu = menubar->add_menu("View");
view_menu.add_action(*m_line_wrapping_setting_action);
view_menu.add_separator();
view_menu.add_action(*m_markdown_preview_action);
view_menu.add_separator();
view_menu.add_submenu(move(font_menu));
view_menu.add_submenu(move(syntax_menu));
@ -445,12 +466,15 @@ void TextEditorWidget::set_path(const FileSystemPath& file)
m_name = file.title();
m_extension = file.extension();
if (m_extension == "cpp" || m_extension == "h")
if (m_extension == "cpp" || m_extension == "h") {
m_cpp_highlight->activate();
else if (m_extension == "js")
} else if (m_extension == "js") {
m_js_highlight->activate();
else
} else {
m_plain_text_highlight->activate();
}
set_markdown_preview_enabled(m_extension == "md");
update_title();
}
@ -515,3 +539,24 @@ void TextEditorWidget::drop_event(GUI::DropEvent& event)
open_sesame(urls.first().path());
}
}
void TextEditorWidget::set_markdown_preview_enabled(bool enabled)
{
if (m_markdown_preview_enabled == enabled)
return;
m_markdown_preview_enabled = enabled;
m_markdown_preview_action->set_checked(enabled);
m_html_view->set_visible(enabled);
if (enabled)
update_markdown_preview();
}
void TextEditorWidget::update_markdown_preview()
{
Markdown::Document document;
if (document.parse(m_editor->text())) {
auto html = document.render_to_html();
auto html_document = Web::parse_html_document(html);
m_html_view->set_document(html_document);
}
}