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serenity/DevTools/VisualBuilder/VBForm.cpp
Andreas Kling 411058b2a3 WindowServer+LibGUI: Implement basic color theming 
Color themes are loaded from .ini files in /res/themes/
The theme can be switched from the "Themes" section in the system menu.

The basic mechanism is that WindowServer broadcasts a SharedBuffer with
all of the color values of the current theme. Clients receive this with
the response to their initial WindowServer::Greet handshake.

When the theme is changed, WindowServer tells everyone by sending out
an UpdateSystemTheme message with a new SharedBuffer to use.

This does feel somewhat bloated somehow, but I'm sure we can iterate on
it over time and improve things.

To get one of the theme colors, use the Color(SystemColor) constructor:

    painter.fill_rect(rect, SystemColor::HoverHighlight);

Some things don't work 100% right without a reboot. Specifically, when
constructing a GWidget, it will set its own background and foreground
colors based on the current SystemColor::Window and SystemColor::Text.
The widget is then stuck with these values, and they don't update on
system theme change, only on app restart.

All in all though, this is pretty cool. Merry Christmas! :^)
2019-12-23 20:33:01 +01:00

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#include "VBForm.h"
#include "VBProperty.h"
#include "VBWidget.h"
#include "VBWidgetRegistry.h"
#include <AK/JsonArray.h>
#include <AK/JsonObject.h>
#include <AK/StringBuilder.h>
#include <LibCore/CFile.h>
#include <LibDraw/PNGLoader.h>
#include <LibGUI/GAction.h>
#include <LibGUI/GBoxLayout.h>
#include <LibGUI/GMenu.h>
#include <LibGUI/GMessageBox.h>
#include <LibGUI/GPainter.h>
static VBForm* s_current;
VBForm* VBForm::current()
{
return s_current;
}
VBForm::VBForm(const String& name, GWidget* parent)
: GWidget(parent)
, m_name(name)
{
s_current = this;
set_fill_with_background_color(true);
set_background_color(SystemColor::Window);
set_greedy_for_hits(true);
m_context_menu = GMenu::construct();
m_context_menu->add_action(GCommonActions::make_move_to_front_action([this](auto&) {
if (auto* widget = single_selected_widget())
widget->gwidget()->move_to_front();
}));
m_context_menu->add_action(GCommonActions::make_move_to_back_action([this](auto&) {
if (auto* widget = single_selected_widget())
widget->gwidget()->move_to_back();
}));
m_context_menu->add_separator();
m_context_menu->add_action(GAction::create("Lay out horizontally", load_png("/res/icons/16x16/layout-horizontally.png"), [this](auto&) {
if (auto* widget = single_selected_widget()) {
dbg() << "Giving " << *widget->gwidget() << " a horizontal box layout";
widget->gwidget()->set_layout(make<GBoxLayout>(Orientation::Horizontal));
}
}));
m_context_menu->add_action(GAction::create("Lay out vertically", load_png("/res/icons/16x16/layout-vertically.png"), [this](auto&) {
if (auto* widget = single_selected_widget()) {
dbg() << "Giving " << *widget->gwidget() << " a vertical box layout";
widget->gwidget()->set_layout(make<GBoxLayout>(Orientation::Vertical));
}
}));
m_context_menu->add_separator();
m_context_menu->add_action(GCommonActions::make_delete_action([this](auto&) {
delete_selected_widgets();
}));
}
void VBForm::context_menu_event(GContextMenuEvent& event)
{
m_context_menu->popup(event.screen_position());
}
void VBForm::insert_widget(VBWidgetType type)
{
auto* insertion_parent = single_selected_widget();
auto widget = VBWidget::create(type, *this, insertion_parent);
Point insertion_position = m_next_insertion_position;
if (insertion_parent)
insertion_position.move_by(insertion_parent->gwidget()->window_relative_rect().location());
widget->set_rect({ insertion_position, { m_grid_size * 10 + 1, m_grid_size * 5 + 1 } });
m_next_insertion_position.move_by(m_grid_size, m_grid_size);
m_widgets.append(move(widget));
}
VBForm::~VBForm()
{
}
void VBForm::paint_event(GPaintEvent& event)
{
GPainter painter(*this);
painter.add_clip_rect(event.rect());
for (int y = 0; y < height(); y += m_grid_size) {
for (int x = 0; x < width(); x += m_grid_size) {
painter.set_pixel({ x, y }, Color::from_rgb(0x404040));
}
}
}
void VBForm::second_paint_event(GPaintEvent& event)
{
GPainter painter(*this);
painter.add_clip_rect(event.rect());
for (auto& widget : m_widgets) {
if (widget.is_selected()) {
for_each_direction([&](auto direction) {
bool in_layout = widget.is_in_layout();
auto grabber_rect = widget.grabber_rect(direction);
painter.fill_rect(grabber_rect, in_layout ? Color::White : Color::Black);
if (in_layout)
painter.draw_rect(grabber_rect, Color::Black);
});
}
}
}
bool VBForm::is_selected(const VBWidget& widget) const
{
// FIXME: Fix HashTable and remove this const_cast.
return m_selected_widgets.contains(const_cast<VBWidget*>(&widget));
}
VBWidget* VBForm::widget_at(const Point& position)
{
auto result = hit_test(position, GWidget::ShouldRespectGreediness::No);
if (!result.widget)
return nullptr;
auto* gwidget = result.widget;
while (gwidget) {
if (auto* widget = m_gwidget_map.get(gwidget).value_or(nullptr))
return widget;
gwidget = gwidget->parent_widget();
}
return nullptr;
}
void VBForm::grabber_mousedown_event(GMouseEvent& event, Direction grabber)
{
m_transform_event_origin = event.position();
for_each_selected_widget([](auto& widget) { widget.capture_transform_origin_rect(); });
m_resize_direction = grabber;
}
void VBForm::keydown_event(GKeyEvent& event)
{
if (event.key() == KeyCode::Key_Delete) {
delete_selected_widgets();
return;
}
if (event.key() == KeyCode::Key_Tab) {
if (m_widgets.is_empty())
return;
if (m_selected_widgets.is_empty()) {
set_single_selected_widget(&m_widgets.first());
update();
return;
}
int selected_widget_index = 0;
for (; selected_widget_index < m_widgets.size(); ++selected_widget_index) {
if (&m_widgets[selected_widget_index] == *m_selected_widgets.begin())
break;
}
++selected_widget_index;
if (selected_widget_index == m_widgets.size())
selected_widget_index = 0;
set_single_selected_widget(&m_widgets[selected_widget_index]);
update();
return;
}
if (!m_selected_widgets.is_empty()) {
switch (event.key()) {
case KeyCode::Key_Up:
update();
for_each_selected_widget([this](auto& widget) {
if (widget.is_in_layout())
return;
widget.gwidget()->move_by(0, -m_grid_size);
});
break;
case KeyCode::Key_Down:
update();
for_each_selected_widget([this](auto& widget) {
if (widget.is_in_layout())
return;
widget.gwidget()->move_by(0, m_grid_size);
});
break;
case KeyCode::Key_Left:
update();
for_each_selected_widget([this](auto& widget) {
if (widget.is_in_layout())
return;
widget.gwidget()->move_by(-m_grid_size, 0);
});
break;
case KeyCode::Key_Right:
update();
for_each_selected_widget([this](auto& widget) {
if (widget.is_in_layout())
return;
widget.gwidget()->move_by(m_grid_size, 0);
});
break;
}
return;
}
}
void VBForm::set_single_selected_widget(VBWidget* widget)
{
if (!widget) {
if (!m_selected_widgets.is_empty()) {
m_selected_widgets.clear();
on_widget_selected(nullptr);
update();
}
return;
}
m_selected_widgets.clear();
m_selected_widgets.set(widget);
on_widget_selected(m_selected_widgets.size() == 1 ? widget : nullptr);
update();
}
void VBForm::add_to_selection(VBWidget& widget)
{
m_selected_widgets.set(&widget);
update();
}
void VBForm::remove_from_selection(VBWidget& widget)
{
m_selected_widgets.remove(&widget);
update();
}
void VBForm::mousedown_event(GMouseEvent& event)
{
if (m_resize_direction == Direction::None) {
bool hit_grabber = false;
for_each_selected_widget([&](auto& widget) {
if (widget.is_in_layout())
return;
auto grabber = widget.grabber_at(event.position());
if (grabber != Direction::None) {
hit_grabber = true;
return grabber_mousedown_event(event, grabber);
}
});
if (hit_grabber)
return;
}
auto* widget = widget_at(event.position());
if (!widget) {
set_single_selected_widget(nullptr);
return;
}
if (event.button() == GMouseButton::Left || event.button() == GMouseButton::Right) {
m_transform_event_origin = event.position();
if (event.modifiers() == Mod_Ctrl)
remove_from_selection(*widget);
else if (event.modifiers() == Mod_Shift)
add_to_selection(*widget);
else if (!m_selected_widgets.contains(widget))
set_single_selected_widget(widget);
for_each_selected_widget([](auto& widget) { widget.capture_transform_origin_rect(); });
on_widget_selected(single_selected_widget());
}
}
void VBForm::mousemove_event(GMouseEvent& event)
{
if (event.buttons() & GMouseButton::Left) {
if (m_resize_direction == Direction::None) {
update();
auto delta = event.position() - m_transform_event_origin;
for_each_selected_widget([&](auto& widget) {
if (widget.is_in_layout())
return;
auto new_rect = widget.transform_origin_rect().translated(delta);
new_rect.set_x(new_rect.x() - (new_rect.x() % m_grid_size));
new_rect.set_y(new_rect.y() - (new_rect.y() % m_grid_size));
widget.set_rect(new_rect);
});
return;
}
int diff_x = event.x() - m_transform_event_origin.x();
int diff_y = event.y() - m_transform_event_origin.y();
int change_x = 0;
int change_y = 0;
int change_w = 0;
int change_h = 0;
switch (m_resize_direction) {
case Direction::DownRight:
change_w = diff_x;
change_h = diff_y;
break;
case Direction::Right:
change_w = diff_x;
break;
case Direction::UpRight:
change_w = diff_x;
change_y = diff_y;
change_h = -diff_y;
break;
case Direction::Up:
change_y = diff_y;
change_h = -diff_y;
break;
case Direction::UpLeft:
change_x = diff_x;
change_w = -diff_x;
change_y = diff_y;
change_h = -diff_y;
break;
case Direction::Left:
change_x = diff_x;
change_w = -diff_x;
break;
case Direction::DownLeft:
change_x = diff_x;
change_w = -diff_x;
change_h = diff_y;
break;
case Direction::Down:
change_h = diff_y;
break;
default:
ASSERT_NOT_REACHED();
}
update();
for_each_selected_widget([&](auto& widget) {
if (widget.is_in_layout())
return;
auto new_rect = widget.transform_origin_rect();
Size minimum_size { 5, 5 };
new_rect.set_x(new_rect.x() + change_x);
new_rect.set_y(new_rect.y() + change_y);
new_rect.set_width(max(minimum_size.width(), new_rect.width() + change_w));
new_rect.set_height(max(minimum_size.height(), new_rect.height() + change_h));
new_rect.set_x(new_rect.x() - (new_rect.x() % m_grid_size));
new_rect.set_y(new_rect.y() - (new_rect.y() % m_grid_size));
new_rect.set_width(new_rect.width() - (new_rect.width() % m_grid_size) + 1);
new_rect.set_height(new_rect.height() - (new_rect.height() % m_grid_size) + 1);
widget.set_rect(new_rect);
});
set_cursor_type_from_grabber(m_resize_direction);
} else {
for (auto& widget : m_selected_widgets) {
if (widget->is_in_layout())
continue;
auto grabber_at = widget->grabber_at(event.position());
set_cursor_type_from_grabber(grabber_at);
if (grabber_at != Direction::None)
break;
}
}
}
void VBForm::load_from_file(const String& path)
{
auto file = CFile::construct(path);
if (!file->open(CIODevice::ReadOnly)) {
GMessageBox::show(String::format("Could not open '%s' for reading", path.characters()), "Error", GMessageBox::Type::Error, GMessageBox::InputType::OK, window());
return;
}
auto file_contents = file->read_all();
auto form_json = JsonValue::from_string(file_contents);
if (!form_json.is_object()) {
GMessageBox::show(String::format("Could not parse '%s'", path.characters()), "Error", GMessageBox::Type::Error, GMessageBox::InputType::OK, window());
return;
}
m_name = form_json.as_object().get("name").to_string();
auto widgets = form_json.as_object().get("widgets").as_array();
widgets.for_each([&](const JsonValue& widget_value) {
auto& widget_object = widget_value.as_object();
auto widget_class = widget_object.get("class").as_string();
auto widget_type = widget_type_from_class_name(widget_class);
// FIXME: Construct VBWidget within the right parent..
auto vbwidget = VBWidget::create(widget_type, *this, nullptr);
widget_object.for_each_member([&](auto& property_name, const JsonValue& property_value) {
(void)property_name;
(void)property_value;
VBProperty& property = vbwidget->property(property_name);
dbgprintf("Set property %s.%s to '%s'\n", widget_class.characters(), property_name.characters(), property_value.to_string().characters());
property.set_value(property_value);
});
m_widgets.append(vbwidget);
});
}
void VBForm::write_to_file(const String& path)
{
auto file = CFile::construct(path);
if (!file->open(CIODevice::WriteOnly)) {
GMessageBox::show(String::format("Could not open '%s' for writing", path.characters()), "Error", GMessageBox::Type::Error, GMessageBox::InputType::OK, window());
return;
}
JsonObject form_object;
form_object.set("name", m_name);
JsonArray widget_array;
for (auto& widget : m_widgets) {
JsonObject widget_object;
widget.for_each_property([&](auto& property) {
if (property.value().is_bool())
widget_object.set(property.name(), property.value().to_bool());
else if (property.value().is_int())
widget_object.set(property.name(), property.value().to_int());
else
widget_object.set(property.name(), property.value().to_string());
});
widget_array.append(widget_object);
}
form_object.set("widgets", widget_array);
file->write(form_object.to_string());
}
void VBForm::dump()
{
dbgprintf("[Form]\n");
dbgprintf("Name=%s\n", m_name.characters());
dbgprintf("\n");
int i = 0;
for (auto& widget : m_widgets) {
dbgprintf("[Widget %d]\n", i++);
widget.for_each_property([](auto& property) {
dbgprintf("%s=%s\n", property.name().characters(), property.value().to_string().characters());
});
dbgprintf("\n");
}
}
void VBForm::mouseup_event(GMouseEvent& event)
{
if (event.button() == GMouseButton::Left) {
m_transform_event_origin = {};
m_resize_direction = Direction::None;
}
}
void VBForm::delete_selected_widgets()
{
Vector<VBWidget*> to_delete;
for_each_selected_widget([&](auto& widget) {
to_delete.append(&widget);
});
if (to_delete.is_empty())
return;
for (auto& widget : to_delete)
m_widgets.remove_first_matching([&widget](auto& entry) { return entry == widget; });
on_widget_selected(single_selected_widget());
update();
}
template<typename Callback>
void VBForm::for_each_selected_widget(Callback callback)
{
for (auto& widget : m_selected_widgets)
callback(*widget);
}
void VBForm::set_cursor_type_from_grabber(Direction grabber)
{
if (grabber == m_mouse_direction_type)
return;
switch (grabber) {
case Direction::Up:
case Direction::Down:
window()->set_override_cursor(GStandardCursor::ResizeVertical);
break;
case Direction::Left:
case Direction::Right:
window()->set_override_cursor(GStandardCursor::ResizeHorizontal);
break;
case Direction::UpLeft:
case Direction::DownRight:
window()->set_override_cursor(GStandardCursor::ResizeDiagonalTLBR);
break;
case Direction::UpRight:
case Direction::DownLeft:
window()->set_override_cursor(GStandardCursor::ResizeDiagonalBLTR);
break;
case Direction::None:
window()->set_override_cursor(GStandardCursor::None);
break;
}
m_mouse_direction_type = grabber;
}
VBWidget* VBForm::single_selected_widget()
{
if (m_selected_widgets.size() != 1)
return nullptr;
return *m_selected_widgets.begin();
}
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