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https://github.com/aseprite/aseprite.git
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1aaeacc460
This is a work-in-progress to create a consistent API and finally separate the whole Aseprite base/gfx/ui libs into a reusable C++ library. Classes: app::IFileItem, app::AppMenuItem, app::skin::SkinPart, gfx::Rect, gfx::Border, she::FileDialog, ui::IButtonIcon, ui::Graphics, ui::Overlay, ui::Widget, ui::ScrollableViewDelegate, and UI events
327 lines
7.0 KiB
C++
327 lines
7.0 KiB
C++
// Aseprite UI Library
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// Copyright (C) 2001-2015 David Capello
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//
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// This file is released under the terms of the MIT license.
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// Read LICENSE.txt for more information.
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#ifdef HAVE_CONFIG_H
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#include "config.h"
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#endif
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#include "ui/listbox.h"
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#include "base/path.h"
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#include "ui/listitem.h"
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#include "ui/message.h"
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#include "ui/size_hint_event.h"
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#include "ui/resize_event.h"
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#include "ui/system.h"
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#include "ui/theme.h"
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#include "ui/view.h"
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namespace ui {
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using namespace gfx;
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ListBox::ListBox()
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: Widget(kListBoxWidget)
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{
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setFocusStop(true);
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initTheme();
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}
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Widget* ListBox::getSelectedChild()
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{
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for (auto child : children())
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if (child->isSelected())
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return child;
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return nullptr;
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}
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int ListBox::getSelectedIndex()
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{
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int i = 0;
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for (auto child : children()) {
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if (child->isSelected())
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return i;
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i++;
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}
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return -1;
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}
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void ListBox::selectChild(Widget* item)
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{
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for (auto child : children()) {
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if (child->isSelected()) {
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if (item && child == item)
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return;
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child->setSelected(false);
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}
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}
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if (item) {
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item->setSelected(true);
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makeChildVisible(item);
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}
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onChange();
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}
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void ListBox::selectIndex(int index)
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{
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const WidgetsList& children = this->children();
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if (index < 0 || index >= (int)children.size())
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return;
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ListItem* child = static_cast<ListItem*>(children[index]);
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ASSERT(child);
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selectChild(child);
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}
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std::size_t ListBox::getItemsCount() const
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{
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return children().size();
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}
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void ListBox::makeChildVisible(Widget* child)
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{
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View* view = View::getView(this);
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if (!view)
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return;
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gfx::Point scroll = view->viewScroll();
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gfx::Rect vp = view->viewportBounds();
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if (child->bounds().y < vp.y)
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scroll.y = child->bounds().y - bounds().y;
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else if (child->bounds().y > vp.y + vp.h - child->bounds().h)
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scroll.y = (child->bounds().y - bounds().y
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- vp.h + child->bounds().h);
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view->setViewScroll(scroll);
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}
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// Setup the scroll to center the selected item in the viewport
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void ListBox::centerScroll()
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{
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View* view = View::getView(this);
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Widget* item = getSelectedChild();
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if (view && item) {
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gfx::Rect vp = view->viewportBounds();
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gfx::Point scroll = view->viewScroll();
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scroll.y = ((item->bounds().y - bounds().y)
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- vp.h/2 + item->bounds().h/2);
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view->setViewScroll(scroll);
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}
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}
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inline bool sort_by_text(Widget* a, Widget* b) {
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return (base::compare_filenames(a->text(), b->text()) < 0);
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}
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void ListBox::sortItems()
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{
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WidgetsList widgets = children();
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std::sort(widgets.begin(), widgets.end(), &sort_by_text);
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// Remove all children and add then again.
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removeAllChildren();
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for (Widget* child : widgets)
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addChild(child);
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}
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bool ListBox::onProcessMessage(Message* msg)
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{
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switch (msg->type()) {
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case kOpenMessage:
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centerScroll();
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break;
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case kMouseDownMessage:
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captureMouse();
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case kMouseMoveMessage:
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if (hasCapture()) {
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gfx::Point mousePos = static_cast<MouseMessage*>(msg)->position();
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int select = getSelectedIndex();
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View* view = View::getView(this);
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bool pick_item = true;
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if (view) {
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gfx::Rect vp = view->viewportBounds();
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if (mousePos.y < vp.y) {
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int num = MAX(1, (vp.y - mousePos.y) / 8);
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selectIndex(select-num);
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pick_item = false;
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}
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else if (mousePos.y >= vp.y + vp.h) {
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int num = MAX(1, (mousePos.y - (vp.y+vp.h-1)) / 8);
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selectIndex(select+num);
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pick_item = false;
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}
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}
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if (pick_item) {
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Widget* picked;
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if (view) {
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picked = view->viewport()->pick(mousePos);
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}
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else {
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picked = pick(mousePos);
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}
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/* if the picked widget is a child of the list, select it */
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if (picked && hasChild(picked)) {
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if (ListItem* pickedItem = dynamic_cast<ListItem*>(picked))
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selectChild(pickedItem);
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}
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}
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return true;
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}
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break;
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case kMouseUpMessage:
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releaseMouse();
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break;
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case kMouseWheelMessage: {
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View* view = View::getView(this);
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if (view) {
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gfx::Point scroll = view->viewScroll();
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scroll += static_cast<MouseMessage*>(msg)->wheelDelta() * textHeight()*3;
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view->setViewScroll(scroll);
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}
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break;
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}
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case kKeyDownMessage:
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if (hasFocus() && !children().empty()) {
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int select = getSelectedIndex();
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View* view = View::getView(this);
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int bottom = MAX(0, children().size()-1);
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KeyMessage* keymsg = static_cast<KeyMessage*>(msg);
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switch (keymsg->scancode()) {
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case kKeyUp:
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// Select previous element.
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if (select >= 0)
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select--;
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// Or select the bottom of the list if there is no
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// selected item.
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else
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select = bottom;
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break;
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case kKeyDown:
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select++;
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break;
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case kKeyHome:
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select = 0;
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break;
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case kKeyEnd:
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select = bottom;
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break;
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case kKeyPageUp:
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if (view) {
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gfx::Rect vp = view->viewportBounds();
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select -= vp.h / textHeight();
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}
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else
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select = 0;
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break;
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case kKeyPageDown:
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if (view) {
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gfx::Rect vp = view->viewportBounds();
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select += vp.h / textHeight();
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}
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else
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select = bottom;
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break;
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case kKeyLeft:
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case kKeyRight:
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if (view) {
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gfx::Rect vp = view->viewportBounds();
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gfx::Point scroll = view->viewScroll();
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int sgn = (keymsg->scancode() == kKeyLeft) ? -1: 1;
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scroll.x += vp.w/2*sgn;
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view->setViewScroll(scroll);
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}
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break;
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default:
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return Widget::onProcessMessage(msg);
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}
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selectIndex(MID(0, select, bottom));
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return true;
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}
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break;
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case kDoubleClickMessage:
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onDoubleClickItem();
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return true;
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}
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return Widget::onProcessMessage(msg);
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}
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void ListBox::onPaint(PaintEvent& ev)
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{
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theme()->paintListBox(ev);
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}
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void ListBox::onResize(ResizeEvent& ev)
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{
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setBoundsQuietly(ev.bounds());
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Rect cpos = childrenBounds();
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for (auto child : children()) {
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cpos.h = child->sizeHint().h;
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child->setBounds(cpos);
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cpos.y += child->bounds().h + this->childSpacing();
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}
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}
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void ListBox::onSizeHint(SizeHintEvent& ev)
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{
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int w = 0, h = 0;
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UI_FOREACH_WIDGET_WITH_END(children(), it, end) {
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Size reqSize = static_cast<ListItem*>(*it)->sizeHint();
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w = MAX(w, reqSize.w);
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h += reqSize.h + (it+1 != end ? this->childSpacing(): 0);
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}
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w += border().width();
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h += border().height();
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ev.setSizeHint(Size(w, h));
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}
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void ListBox::onChange()
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{
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Change();
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}
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void ListBox::onDoubleClickItem()
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{
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DoubleClickItem();
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}
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} // namespace ui
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