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ladybird/Libraries/LibGUI/TableView.cpp
Andreas Kling 9cf37901cd LibGUI: Add a cursor to AbstractView, separate from the selection 
Views now have a cursor index (retrievable via cursor_index()) which
is separate from the selection.

Until now, we've been using the first entry in the selection as
"the cursor", which gets messy whenever you want to select more than
one index in the model.

When setting the cursor, the selection is implicitly updated as well
to maintain the old behavior (for the most part.)

Going forward, this will make it much easier to implement things like
shift-select (extend selection from cursor) and such. :^)
2020-08-27 18:36:31 +02:00

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/*
* 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 <AK/StringBuilder.h>
#include <LibGUI/Action.h>
#include <LibGUI/HeaderView.h>
#include <LibGUI/Menu.h>
#include <LibGUI/Model.h>
#include <LibGUI/Painter.h>
#include <LibGUI/ScrollBar.h>
#include <LibGUI/TableView.h>
#include <LibGUI/TextBox.h>
#include <LibGUI/Window.h>
#include <LibGfx/Palette.h>
namespace GUI {
TableView::TableView()
{
set_fill_with_background_color(true);
set_background_role(ColorRole::Base);
set_foreground_role(ColorRole::BaseText);
}
TableView::~TableView()
{
}
void TableView::paint_event(PaintEvent& event)
{
Color widget_background_color = palette().color(background_role());
Frame::paint_event(event);
Painter painter(*this);
painter.add_clip_rect(frame_inner_rect());
painter.add_clip_rect(event.rect());
if (fill_with_background_color())
painter.fill_rect(event.rect(), widget_background_color);
painter.translate(frame_thickness(), frame_thickness());
painter.translate(-horizontal_scrollbar().value(), -vertical_scrollbar().value());
if (!model())
return;
int exposed_width = max(content_size().width(), width());
int x_offset = row_header().is_visible() ? row_header().width() : 0;
int y_offset = column_header().is_visible() ? column_header().height() : 0;
bool dummy;
int first_visible_row = index_at_event_position(frame_inner_rect().top_left(), dummy).row();
int last_visible_row = index_at_event_position(frame_inner_rect().bottom_right(), dummy).row();
if (first_visible_row == -1)
first_visible_row = 0;
if (last_visible_row == -1)
last_visible_row = model()->row_count() - 1;
int painted_item_index = first_visible_row;
for (int row_index = first_visible_row; row_index <= last_visible_row; ++row_index) {
bool is_selected_row = selection().contains_row(row_index);
int y = y_offset + painted_item_index * row_height();
Color background_color;
Color key_column_background_color;
if (is_selected_row && highlight_selected_rows()) {
background_color = is_focused() ? palette().selection() : palette().inactive_selection();
key_column_background_color = is_focused() ? palette().selection() : palette().inactive_selection();
} else {
if (alternating_row_colors() && (painted_item_index % 2)) {
background_color = widget_background_color.darkened(0.8f);
key_column_background_color = widget_background_color.darkened(0.7f);
} else {
background_color = widget_background_color;
key_column_background_color = widget_background_color.darkened(0.9f);
}
}
painter.fill_rect(row_rect(painted_item_index), background_color);
int x = x_offset;
for (int column_index = 0; column_index < model()->column_count(); ++column_index) {
if (!column_header().is_section_visible(column_index))
continue;
int column_width = this->column_width(column_index);
bool is_key_column = m_key_column == column_index;
Gfx::IntRect cell_rect(horizontal_padding() + x, y, column_width, row_height());
auto cell_rect_for_fill = cell_rect.inflated(horizontal_padding() * 2, 0);
if (is_key_column)
painter.fill_rect(cell_rect_for_fill, key_column_background_color);
auto cell_index = model()->index(row_index, column_index);
if (auto* delegate = column_painting_delegate(column_index)) {
delegate->paint(painter, cell_rect, palette(), cell_index);
} else {
auto data = cell_index.data();
if (data.is_bitmap()) {
painter.blit(cell_rect.location(), data.as_bitmap(), data.as_bitmap().rect());
} else if (data.is_icon()) {
if (auto bitmap = data.as_icon().bitmap_for_size(16)) {
if (m_hovered_index.is_valid() && cell_index.row() == m_hovered_index.row())
painter.blit_brightened(cell_rect.location(), *bitmap, bitmap->rect());
else
painter.blit(cell_rect.location(), *bitmap, bitmap->rect());
}
} else {
Color text_color;
if (is_selected_row)
text_color = is_focused() ? palette().selection_text() : palette().inactive_selection_text();
else
text_color = cell_index.data(ModelRole::ForegroundColor).to_color(palette().color(foreground_role()));
if (!is_selected_row) {
auto cell_background_color = cell_index.data(ModelRole::BackgroundColor);
if (cell_background_color.is_valid())
painter.fill_rect(cell_rect_for_fill, cell_background_color.to_color(background_color));
}
auto text_alignment = cell_index.data(ModelRole::TextAlignment).to_text_alignment(Gfx::TextAlignment::CenterLeft);
painter.draw_text(cell_rect, data.to_string(), font_for_index(cell_index), text_alignment, text_color, Gfx::TextElision::Right);
}
}
x += column_width + horizontal_padding() * 2;
}
++painted_item_index;
};
Gfx::IntRect unpainted_rect(0, column_header().height() + painted_item_index * row_height(), exposed_width, height());
if (fill_with_background_color())
painter.fill_rect(unpainted_rect, widget_background_color);
}
void TableView::keydown_event(KeyEvent& event)
{
if (!model())
return;
if (event.key() == KeyCode::Key_Return) {
activate_or_edit_selected();
return;
}
return AbstractTableView::keydown_event(event);
}
void TableView::move_cursor(CursorMovement movement, SelectionUpdate selection_update)
{
if (!model())
return;
auto& model = *this->model();
switch (movement) {
case CursorMovement::Left:
move_cursor_relative(0, -1, selection_update);
break;
case CursorMovement::Right:
move_cursor_relative(0, 1, selection_update);
break;
case CursorMovement::Up:
move_cursor_relative(-1, 0, selection_update);
break;
case CursorMovement::Down:
move_cursor_relative(1, 0, selection_update);
break;
case CursorMovement::Home: {
auto index = model.index(0, 0);
set_cursor(index, selection_update);
scroll_into_view(index, false, true);
break;
}
case CursorMovement::End: {
auto index = model.index(model.row_count() - 1, 0);
set_cursor(index, selection_update);
scroll_into_view(index, false, true);
break;
}
case CursorMovement::PageUp: {
int items_per_page = visible_content_rect().height() / row_height();
auto old_index = selection().first();
auto new_index = model.index(max(0, old_index.row() - items_per_page), old_index.column());
if (model.is_valid(new_index))
set_cursor(new_index, selection_update);
break;
}
case CursorMovement::PageDown: {
int items_per_page = visible_content_rect().height() / row_height();
auto old_index = selection().first();
auto new_index = model.index(min(model.row_count() - 1, old_index.row() + items_per_page), old_index.column());
if (model.is_valid(new_index))
set_cursor(new_index, selection_update);
break;
}
}
}
}
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