ladybird/Userland/Libraries/LibGUI/LinkLabel.cpp

/*
 * Copyright (c) 2020, Alex McGrath <amk@amk.ie>
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *
 * 1. Redistributions of source code must retain the above copyright notice, this
 *    list of conditions and the following disclaimer.
 *
 * 2. Redistributions in binary form must reproduce the above copyright notice,
 *    this list of conditions and the following disclaimer in the documentation
 *    and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

#include <LibGUI/Action.h>
#include <LibGUI/Clipboard.h>
#include <LibGUI/Event.h>
#include <LibGUI/LinkLabel.h>
#include <LibGUI/Menu.h>
#include <LibGUI/Painter.h>
#include <LibGUI/Window.h>
#include <LibGfx/Font.h>
#include <LibGfx/Palette.h>

REGISTER_WIDGET(GUI, LinkLabel)

namespace GUI {

LinkLabel::LinkLabel(String text)
    : Label(move(text))
{
    set_override_cursor(Gfx::StandardCursor::Hand);
    set_foreground_role(Gfx::ColorRole::Link);
    set_focus_policy(FocusPolicy::TabFocus);
    setup_actions();
}

void LinkLabel::setup_actions()
{
    m_open_action = CommonActions::make_open_action([this](auto&) {
        if (on_click)
            on_click();
    },
        this);

    m_copy_action = CommonActions::make_copy_action([this](auto&) { Clipboard::the().set_plain_text(text()); }, this);
}

void LinkLabel::mousedown_event(MouseEvent& event)
{
    if (event.button() != MouseButton::Left)
        return;

    Label::mousedown_event(event);
    if (on_click) {
        on_click();
    }
}

void LinkLabel::keydown_event(KeyEvent& event)
{
    Label::keydown_event(event);
    if (event.key() == KeyCode::Key_Return || event.key() == KeyCode::Key_Space) {
        if (on_click)
            on_click();
    }
}

void LinkLabel::paint_event(PaintEvent& event)
{
    Label::paint_event(event);
    GUI::Painter painter(*this);

    if (m_hovered)
        painter.draw_line({ 0, rect().bottom() }, { font().width(text()), rect().bottom() }, palette().link());

    if (is_focused())
        painter.draw_focus_rect(text_rect(), palette().focus_outline());
}

void LinkLabel::enter_event(Core::Event& event)
{
    Label::enter_event(event);
    m_hovered = true;
    update();
}

void LinkLabel::leave_event(Core::Event& event)
{
    Label::leave_event(event);
    m_hovered = false;
    update();
}

void LinkLabel::did_change_text()
{
    Label::did_change_text();
    update_tooltip_if_needed();
}

void LinkLabel::update_tooltip_if_needed()
{
    if (width() < font().width(text())) {
        set_tooltip(text());
    } else {
        set_tooltip({});
    }
}

void LinkLabel::resize_event(ResizeEvent& event)
{
    Label::resize_event(event);
    update_tooltip_if_needed();
}

void LinkLabel::context_menu_event(ContextMenuEvent& event)
{
    if (!m_context_menu) {
        m_context_menu = Menu::construct();
        m_context_menu->add_action(*m_open_action);
        m_context_menu->add_separator();
        m_context_menu->add_action(*m_copy_action);
    }
    m_context_menu->popup(event.screen_position(), m_open_action);
}

}