LibGUI: Remove leading G from filenames

1 files changed, 377 insertions, 0 deletions

diff --git a/Libraries/LibGUI/ScrollBar.cpp b/Libraries/LibGUI/ScrollBar.cpp
new file mode 100644
index 0000000000..c50f3fb7b4
--- /dev/null
+++ b/Libraries/LibGUI/ScrollBar.cpp
@@ -0,0 +1,377 @@
+/*
+ * Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
+ * 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 <LibGfx/CharacterBitmap.h>
+#include <LibGfx/Bitmap.h>
+#include <LibGfx/Palette.h>
+#include <LibGfx/StylePainter.h>
+#include <LibGUI/Painter.h>
+#include <LibGUI/ScrollBar.h>
+
+namespace GUI {
+
+static const char* s_up_arrow_bitmap_data = {
+    "         "
+    "    #    "
+    "   ###   "
+    "  #####  "
+    " ####### "
+    "   ###   "
+    "   ###   "
+    "   ###   "
+    "         "
+};
+
+static const char* s_down_arrow_bitmap_data = {
+    "         "
+    "   ###   "
+    "   ###   "
+    "   ###   "
+    " ####### "
+    "  #####  "
+    "   ###   "
+    "    #    "
+    "         "
+};
+
+static const char* s_left_arrow_bitmap_data = {
+    "         "
+    "    #    "
+    "   ##    "
+    "  ###### "
+    " ####### "
+    "  ###### "
+    "   ##    "
+    "    #    "
+    "         "
+};
+
+static const char* s_right_arrow_bitmap_data = {
+    "         "
+    "    #    "
+    "    ##   "
+    " ######  "
+    " ####### "
+    " ######  "
+    "    ##   "
+    "    #    "
+    "         "
+};
+
+static Gfx::CharacterBitmap* s_up_arrow_bitmap;
+static Gfx::CharacterBitmap* s_down_arrow_bitmap;
+static Gfx::CharacterBitmap* s_left_arrow_bitmap;
+static Gfx::CharacterBitmap* s_right_arrow_bitmap;
+
+ScrollBar::ScrollBar(Widget* parent)
+    : ScrollBar(Orientation::Vertical, parent)
+{
+}
+
+ScrollBar::ScrollBar(Orientation orientation, Widget* parent)
+    : Widget(parent)
+    , m_orientation(orientation)
+{
+    m_automatic_scrolling_timer = Core::Timer::construct(this);
+    if (!s_up_arrow_bitmap)
+        s_up_arrow_bitmap = &Gfx::CharacterBitmap::create_from_ascii(s_up_arrow_bitmap_data, 9, 9).leak_ref();
+    if (!s_down_arrow_bitmap)
+        s_down_arrow_bitmap = &Gfx::CharacterBitmap::create_from_ascii(s_down_arrow_bitmap_data, 9, 9).leak_ref();
+    if (!s_left_arrow_bitmap)
+        s_left_arrow_bitmap = &Gfx::CharacterBitmap::create_from_ascii(s_left_arrow_bitmap_data, 9, 9).leak_ref();
+    if (!s_right_arrow_bitmap)
+        s_right_arrow_bitmap = &Gfx::CharacterBitmap::create_from_ascii(s_right_arrow_bitmap_data, 9, 9).leak_ref();
+
+    if (m_orientation == Orientation::Vertical) {
+        set_preferred_size(15, 0);
+    } else {
+        set_preferred_size(0, 15);
+    }
+
+    m_automatic_scrolling_timer->set_interval(100);
+    m_automatic_scrolling_timer->on_timeout = [this] {
+        on_automatic_scrolling_timer_fired();
+    };
+}
+
+ScrollBar::~ScrollBar()
+{
+}
+
+void ScrollBar::set_range(int min, int max)
+{
+    ASSERT(min <= max);
+    if (m_min == min && m_max == max)
+        return;
+
+    m_min = min;
+    m_max = max;
+
+    int old_value = m_value;
+    m_value = clamp(m_value, m_min, m_max);
+    if (on_change && m_value != old_value)
+        on_change(m_value);
+
+    update();
+}
+
+void ScrollBar::set_value(int value)
+{
+    value = clamp(value, m_min, m_max);
+    if (value == m_value)
+        return;
+    m_value = value;
+    if (on_change)
+        on_change(value);
+    update();
+}
+
+Gfx::Rect ScrollBar::decrement_button_rect() const
+{
+    return { 0, 0, button_width(), button_height() };
+}
+
+Gfx::Rect ScrollBar::increment_button_rect() const
+{
+    if (orientation() == Orientation::Vertical)
+        return { 0, height() - button_height(), button_width(), button_height() };
+    else
+        return { width() - button_width(), 0, button_width(), button_height() };
+}
+
+Gfx::Rect ScrollBar::decrement_gutter_rect() const
+{
+    if (orientation() == Orientation::Vertical)
+        return { 0, button_height(), button_width(), scrubber_rect().top() - button_height() };
+    else
+        return { button_width(), 0, scrubber_rect().x() - button_width(), button_height() };
+}
+
+Gfx::Rect ScrollBar::increment_gutter_rect() const
+{
+    auto scrubber_rect = this->scrubber_rect();
+    if (orientation() == Orientation::Vertical)
+        return { 0, scrubber_rect.bottom() + 1, button_width(), height() - button_height() - scrubber_rect.bottom() - 1 };
+    else
+        return { scrubber_rect.right() + 1, 0, width() - button_width() - scrubber_rect.right() - 1, button_width() };
+}
+
+int ScrollBar::scrubbable_range_in_pixels() const
+{
+    if (orientation() == Orientation::Vertical)
+        return height() - button_height() * 2 - scrubber_size();
+    else
+        return width() - button_width() * 2 - scrubber_size();
+}
+
+bool ScrollBar::has_scrubber() const
+{
+    return m_max != m_min;
+}
+
+int ScrollBar::scrubber_size() const
+{
+    int pixel_range = length(orientation()) - button_size() * 2;
+    int value_range = m_max - m_min;
+    return ::max(pixel_range - value_range, button_size());
+}
+
+Gfx::Rect ScrollBar::scrubber_rect() const
+{
+    if (!has_scrubber() || length(orientation()) <= (button_size() * 2) + scrubber_size())
+        return {};
+    float x_or_y;
+    if (m_value == m_min)
+        x_or_y = button_size();
+    else if (m_value == m_max)
+        x_or_y = (length(orientation()) - button_size() - scrubber_size()) + 1;
+    else {
+        float range_size = m_max - m_min;
+        float available = scrubbable_range_in_pixels();
+        float step = available / range_size;
+        x_or_y = (button_size() + (step * m_value));
+    }
+
+    if (orientation() == Orientation::Vertical)
+        return { 0, (int)x_or_y, button_width(), scrubber_size() };
+    else
+        return { (int)x_or_y, 0, scrubber_size(), button_height() };
+}
+
+void ScrollBar::paint_event(PaintEvent& event)
+{
+    Painter painter(*this);
+    painter.add_clip_rect(event.rect());
+
+    painter.fill_rect(rect(), palette().button().lightened());
+
+    Gfx::StylePainter::paint_button(painter, decrement_button_rect(), palette(), Gfx::ButtonStyle::Normal, false, m_hovered_component == Component::DecrementButton);
+    Gfx::StylePainter::paint_button(painter, increment_button_rect(), palette(), Gfx::ButtonStyle::Normal, false, m_hovered_component == Component::IncrementButton);
+
+    if (length(orientation()) > default_button_size()) {
+        painter.draw_bitmap(decrement_button_rect().location().translated(3, 3), orientation() == Orientation::Vertical ? *s_up_arrow_bitmap : *s_left_arrow_bitmap, has_scrubber() ? palette().button_text() : palette().threed_shadow1());
+        painter.draw_bitmap(increment_button_rect().location().translated(3, 3), orientation() == Orientation::Vertical ? *s_down_arrow_bitmap : *s_right_arrow_bitmap, has_scrubber() ? palette().button_text() : palette().threed_shadow1());
+    }
+
+    if (has_scrubber())
+        Gfx::StylePainter::paint_button(painter, scrubber_rect(), palette(), Gfx::ButtonStyle::Normal, false, m_hovered_component == Component::Scrubber || m_scrubber_in_use);
+}
+
+void ScrollBar::on_automatic_scrolling_timer_fired()
+{
+    if (m_automatic_scrolling_direction == AutomaticScrollingDirection::Decrement) {
+        set_value(value() - m_step);
+        return;
+    }
+    if (m_automatic_scrolling_direction == AutomaticScrollingDirection::Increment) {
+        set_value(value() + m_step);
+        return;
+    }
+}
+
+void ScrollBar::mousedown_event(MouseEvent& event)
+{
+    if (event.button() != MouseButton::Left)
+        return;
+    if (decrement_button_rect().contains(event.position())) {
+        m_automatic_scrolling_direction = AutomaticScrollingDirection::Decrement;
+        set_automatic_scrolling_active(true);
+        return;
+    }
+    if (increment_button_rect().contains(event.position())) {
+        m_automatic_scrolling_direction = AutomaticScrollingDirection::Increment;
+        set_automatic_scrolling_active(true);
+        return;
+    }
+    if (has_scrubber() && scrubber_rect().contains(event.position())) {
+        m_scrubber_in_use = true;
+        m_scrubbing = true;
+        m_scrub_start_value = value();
+        m_scrub_origin = event.position();
+        update();
+        return;
+    }
+
+    if (has_scrubber()) {
+        float range_size = m_max - m_min;
+        float available = scrubbable_range_in_pixels();
+
+        float x = ::max(0, event.position().x() - button_width() - button_width() / 2);
+        float y = ::max(0, event.position().y() - button_height() - button_height() / 2);
+
+        float rel_x = x / available;
+        float rel_y = y / available;
+
+        if (orientation() == Orientation::Vertical)
+            set_value(m_min + rel_y * range_size);
+        else
+            set_value(m_min + rel_x * range_size);
+
+        m_scrubbing = true;
+        m_scrub_start_value = value();
+        m_scrub_origin = event.position();
+    }
+}
+
+void ScrollBar::mouseup_event(MouseEvent& event)
+{
+    if (event.button() != MouseButton::Left)
+        return;
+    m_scrubber_in_use = false;
+    m_automatic_scrolling_direction = AutomaticScrollingDirection::None;
+    set_automatic_scrolling_active(false);
+    if (!m_scrubbing)
+        return;
+    m_scrubbing = false;
+    update();
+}
+
+void ScrollBar::mousewheel_event(MouseEvent& event)
+{
+    if (!is_scrollable())
+        return;
+    set_value(value() + event.wheel_delta() * m_step);
+    Widget::mousewheel_event(event);
+}
+
+void ScrollBar::set_automatic_scrolling_active(bool active)
+{
+    if (active) {
+        on_automatic_scrolling_timer_fired();
+        m_automatic_scrolling_timer->start();
+    } else {
+        m_automatic_scrolling_timer->stop();
+    }
+}
+
+void ScrollBar::mousemove_event(MouseEvent& event)
+{
+    auto old_hovered_component = m_hovered_component;
+    if (scrubber_rect().contains(event.position()))
+        m_hovered_component = Component::Scrubber;
+    else if (decrement_button_rect().contains(event.position()))
+        m_hovered_component = Component::DecrementButton;
+    else if (increment_button_rect().contains(event.position()))
+        m_hovered_component = Component::IncrementButton;
+    else if (rect().contains(event.position()))
+        m_hovered_component = Component::Gutter;
+    else
+        m_hovered_component = Component::Invalid;
+    if (old_hovered_component != m_hovered_component) {
+        update();
+
+        if (m_automatic_scrolling_direction == AutomaticScrollingDirection::Decrement)
+            set_automatic_scrolling_active(m_hovered_component == Component::DecrementButton);
+        else if (m_automatic_scrolling_direction == AutomaticScrollingDirection::Increment)
+            set_automatic_scrolling_active(m_hovered_component == Component::IncrementButton);
+    }
+    if (!m_scrubbing)
+        return;
+    float delta = orientation() == Orientation::Vertical ? (event.y() - m_scrub_origin.y()) : (event.x() - m_scrub_origin.x());
+    float scrubbable_range = scrubbable_range_in_pixels();
+    float value_steps_per_scrubbed_pixel = (m_max - m_min) / scrubbable_range;
+    float new_value = m_scrub_start_value + (value_steps_per_scrubbed_pixel * delta);
+    set_value(new_value);
+}
+
+void ScrollBar::leave_event(Core::Event&)
+{
+    if (m_hovered_component != Component::Invalid) {
+        m_hovered_component = Component::Invalid;
+        update();
+    }
+}
+
+void ScrollBar::change_event(Event& event)
+{
+    if (event.type() == Event::Type::EnabledChange) {
+        if (!is_enabled())
+            m_scrubbing = false;
+    }
+    return Widget::change_event(event);
+}
+
+}