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463
irr/src/CGUIComboBox.cpp
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463
irr/src/CGUIComboBox.cpp
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// Copyright (C) 2002-2012 Nikolaus Gebhardt
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// This file is part of the "Irrlicht Engine".
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// For conditions of distribution and use, see copyright notice in irrlicht.h
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#include "CGUIComboBox.h"
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#include "IGUIEnvironment.h"
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#include "IVideoDriver.h"
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#include "IGUISkin.h"
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#include "IGUIEnvironment.h"
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#include "IGUIFont.h"
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#include "IGUIButton.h"
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#include "CGUIListBox.h"
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#include "os.h"
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namespace irr
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{
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namespace gui
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{
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//! constructor
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CGUIComboBox::CGUIComboBox(IGUIEnvironment *environment, IGUIElement *parent,
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s32 id, core::rect<s32> rectangle) :
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IGUIComboBox(environment, parent, id, rectangle),
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ListButton(nullptr), SelectedText(nullptr), ListBox(nullptr), LastFocus(nullptr),
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Selected(-1), HAlign(EGUIA_UPPERLEFT), VAlign(EGUIA_CENTER), MaxSelectionRows(5), HasFocus(false),
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ActiveFont(nullptr)
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{
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#ifdef _DEBUG
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setDebugName("CGUIComboBox");
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#endif
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IGUISkin *skin = Environment->getSkin();
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ListButton = Environment->addButton(core::recti(0, 0, 1, 1), this, -1, L"");
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if (skin && skin->getSpriteBank()) {
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ListButton->setSpriteBank(skin->getSpriteBank());
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ListButton->setSprite(EGBS_BUTTON_UP, skin->getIcon(EGDI_CURSOR_DOWN), skin->getColor(EGDC_WINDOW_SYMBOL));
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ListButton->setSprite(EGBS_BUTTON_DOWN, skin->getIcon(EGDI_CURSOR_DOWN), skin->getColor(EGDC_WINDOW_SYMBOL));
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}
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ListButton->setAlignment(EGUIA_LOWERRIGHT, EGUIA_LOWERRIGHT, EGUIA_UPPERLEFT, EGUIA_LOWERRIGHT);
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ListButton->setSubElement(true);
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ListButton->setTabStop(false);
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SelectedText = Environment->addStaticText(L"", core::recti(0, 0, 1, 1), false, false, this, -1, false);
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SelectedText->setSubElement(true);
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SelectedText->setAlignment(EGUIA_UPPERLEFT, EGUIA_LOWERRIGHT, EGUIA_UPPERLEFT, EGUIA_LOWERRIGHT);
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SelectedText->setTextAlignment(EGUIA_UPPERLEFT, EGUIA_CENTER);
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if (skin)
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SelectedText->setOverrideColor(skin->getColor(EGDC_BUTTON_TEXT));
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SelectedText->enableOverrideColor(true);
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updateListButtonWidth(skin ? skin->getSize(EGDS_SCROLLBAR_SIZE) : 15);
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// this element can be tabbed to
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setTabStop(true);
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setTabOrder(-1);
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}
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void CGUIComboBox::setTextAlignment(EGUI_ALIGNMENT horizontal, EGUI_ALIGNMENT vertical)
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{
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HAlign = horizontal;
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VAlign = vertical;
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SelectedText->setTextAlignment(horizontal, vertical);
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}
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//! Set the maximal number of rows for the selection listbox
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void CGUIComboBox::setMaxSelectionRows(u32 max)
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{
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MaxSelectionRows = max;
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// force recalculation of open listbox
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if (ListBox) {
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openCloseMenu();
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openCloseMenu();
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}
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}
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//! Get the maximal number of rows for the selection listbox
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u32 CGUIComboBox::getMaxSelectionRows() const
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{
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return MaxSelectionRows;
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}
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//! Returns amount of items in box
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u32 CGUIComboBox::getItemCount() const
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{
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return Items.size();
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}
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//! returns string of an item. the idx may be a value from 0 to itemCount-1
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const wchar_t *CGUIComboBox::getItem(u32 idx) const
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{
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if (idx >= Items.size())
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return 0;
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return Items[idx].Name.c_str();
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}
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//! returns string of an item. the idx may be a value from 0 to itemCount-1
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u32 CGUIComboBox::getItemData(u32 idx) const
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{
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if (idx >= Items.size())
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return 0;
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return Items[idx].Data;
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}
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//! Returns index based on item data
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s32 CGUIComboBox::getIndexForItemData(u32 data) const
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{
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for (u32 i = 0; i < Items.size(); ++i) {
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if (Items[i].Data == data)
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return i;
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}
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return -1;
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}
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//! Removes an item from the combo box.
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void CGUIComboBox::removeItem(u32 idx)
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{
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if (idx >= Items.size())
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return;
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if (Selected == (s32)idx)
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setSelected(-1);
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Items.erase(idx);
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}
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//! Returns caption of this element.
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const wchar_t *CGUIComboBox::getText() const
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{
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return getItem(Selected);
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}
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//! adds an item and returns the index of it
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u32 CGUIComboBox::addItem(const wchar_t *text, u32 data)
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{
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Items.push_back(SComboData(text, data));
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if (Selected == -1)
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setSelected(0);
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return Items.size() - 1;
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}
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//! deletes all items in the combo box
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void CGUIComboBox::clear()
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{
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Items.clear();
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setSelected(-1);
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}
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//! returns id of selected item. returns -1 if no item is selected.
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s32 CGUIComboBox::getSelected() const
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{
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return Selected;
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}
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//! sets the selected item. Set this to -1 if no item should be selected
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void CGUIComboBox::setSelected(s32 idx)
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{
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if (idx < -1 || idx >= (s32)Items.size())
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return;
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Selected = idx;
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if (Selected == -1)
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SelectedText->setText(L"");
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else
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SelectedText->setText(Items[Selected].Name.c_str());
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}
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//! Sets the selected item and emits a change event.
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/** Set this to -1 if no item should be selected */
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void CGUIComboBox::setAndSendSelected(s32 idx)
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{
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setSelected(idx);
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sendSelectionChangedEvent();
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}
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//! called if an event happened.
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bool CGUIComboBox::OnEvent(const SEvent &event)
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{
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if (isEnabled()) {
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switch (event.EventType) {
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case EET_KEY_INPUT_EVENT:
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if (ListBox && event.KeyInput.PressedDown && event.KeyInput.Key == KEY_ESCAPE) {
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// hide list box
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openCloseMenu();
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return true;
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} else if (event.KeyInput.Key == KEY_RETURN || event.KeyInput.Key == KEY_SPACE) {
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if (!event.KeyInput.PressedDown) {
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openCloseMenu();
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}
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ListButton->setPressed(ListBox == nullptr);
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return true;
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} else if (event.KeyInput.PressedDown) {
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s32 oldSelected = Selected;
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bool absorb = true;
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switch (event.KeyInput.Key) {
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case KEY_DOWN:
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setSelected(Selected + 1);
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break;
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case KEY_UP:
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setSelected(Selected - 1);
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break;
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case KEY_HOME:
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case KEY_PRIOR:
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setSelected(0);
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break;
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case KEY_END:
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case KEY_NEXT:
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setSelected((s32)Items.size() - 1);
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break;
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default:
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absorb = false;
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}
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if (Selected < 0)
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setSelected(0);
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if (Selected >= (s32)Items.size())
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setSelected((s32)Items.size() - 1);
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if (Selected != oldSelected) {
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sendSelectionChangedEvent();
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return true;
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}
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if (absorb)
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return true;
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}
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break;
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case EET_GUI_EVENT:
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switch (event.GUIEvent.EventType) {
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case EGET_ELEMENT_FOCUS_LOST:
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if (ListBox &&
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(Environment->hasFocus(ListBox) || ListBox->isMyChild(event.GUIEvent.Caller)) &&
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event.GUIEvent.Element != this &&
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!isMyChild(event.GUIEvent.Element) &&
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!ListBox->isMyChild(event.GUIEvent.Element)) {
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openCloseMenu();
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}
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break;
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case EGET_BUTTON_CLICKED:
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if (event.GUIEvent.Caller == ListButton) {
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openCloseMenu();
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return true;
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}
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break;
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case EGET_LISTBOX_SELECTED_AGAIN:
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case EGET_LISTBOX_CHANGED:
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if (event.GUIEvent.Caller == ListBox) {
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setSelected(ListBox->getSelected());
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if (Selected < 0 || Selected >= (s32)Items.size())
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setSelected(-1);
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openCloseMenu();
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sendSelectionChangedEvent();
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}
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return true;
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default:
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break;
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}
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break;
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case EET_MOUSE_INPUT_EVENT:
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switch (event.MouseInput.Event) {
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case EMIE_LMOUSE_PRESSED_DOWN: {
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core::position2d<s32> p(event.MouseInput.X, event.MouseInput.Y);
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// send to list box
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if (ListBox && ListBox->isPointInside(p) && ListBox->OnEvent(event))
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return true;
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return true;
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}
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case EMIE_LMOUSE_LEFT_UP: {
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core::position2d<s32> p(event.MouseInput.X, event.MouseInput.Y);
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// send to list box
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if (!(ListBox &&
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ListBox->getAbsolutePosition().isPointInside(p) &&
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ListBox->OnEvent(event))) {
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openCloseMenu();
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}
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return true;
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}
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case EMIE_MOUSE_WHEEL: {
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// Try scrolling parent first
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if (IGUIElement::OnEvent(event))
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return true;
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s32 oldSelected = Selected;
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setSelected(Selected + ((event.MouseInput.Wheel < 0) ? 1 : -1));
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if (Selected < 0)
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setSelected(0);
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if (Selected >= (s32)Items.size())
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setSelected((s32)Items.size() - 1);
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if (Selected != oldSelected) {
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sendSelectionChangedEvent();
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return true;
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}
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return false;
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}
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default:
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break;
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}
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break;
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default:
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break;
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}
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}
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return IGUIElement::OnEvent(event);
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}
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void CGUIComboBox::sendSelectionChangedEvent()
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{
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if (Parent) {
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SEvent event;
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event.EventType = EET_GUI_EVENT;
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event.GUIEvent.Caller = this;
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event.GUIEvent.Element = nullptr;
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event.GUIEvent.EventType = EGET_COMBO_BOX_CHANGED;
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Parent->OnEvent(event);
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}
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}
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void CGUIComboBox::updateListButtonWidth(s32 width)
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{
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if (ListButton->getRelativePosition().getWidth() != width) {
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core::rect<s32> r;
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r.UpperLeftCorner.X = RelativeRect.getWidth() - width - 2;
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r.LowerRightCorner.X = RelativeRect.getWidth() - 2;
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r.UpperLeftCorner.Y = 2;
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r.LowerRightCorner.Y = RelativeRect.getHeight() - 2;
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ListButton->setRelativePosition(r);
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r.UpperLeftCorner.X = 2;
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r.UpperLeftCorner.Y = 2;
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r.LowerRightCorner.X = RelativeRect.getWidth() - (width + 2);
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r.LowerRightCorner.Y = RelativeRect.getHeight() - 2;
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SelectedText->setRelativePosition(r);
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}
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}
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//! draws the element and its children
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void CGUIComboBox::draw()
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{
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if (!IsVisible)
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return;
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IGUISkin *skin = Environment->getSkin();
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updateListButtonWidth(skin->getSize(EGDS_SCROLLBAR_SIZE));
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// font changed while the listbox is open?
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if (ActiveFont != skin->getFont() && ListBox) {
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// close and re-open to use new font-size
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openCloseMenu();
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openCloseMenu();
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}
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IGUIElement *currentFocus = Environment->getFocus();
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if (currentFocus != LastFocus) {
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HasFocus = currentFocus == this || isMyChild(currentFocus);
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LastFocus = currentFocus;
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}
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// set colors each time as skin-colors can be changed
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SelectedText->setBackgroundColor(skin->getColor(EGDC_HIGH_LIGHT));
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if (isEnabled()) {
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SelectedText->setDrawBackground(HasFocus);
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SelectedText->setOverrideColor(skin->getColor(HasFocus ? EGDC_HIGH_LIGHT_TEXT : EGDC_BUTTON_TEXT));
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} else {
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SelectedText->setDrawBackground(false);
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SelectedText->setOverrideColor(skin->getColor(EGDC_GRAY_TEXT));
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}
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ListButton->setSprite(EGBS_BUTTON_UP, skin->getIcon(EGDI_CURSOR_DOWN), skin->getColor(isEnabled() ? EGDC_WINDOW_SYMBOL : EGDC_GRAY_WINDOW_SYMBOL));
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ListButton->setSprite(EGBS_BUTTON_DOWN, skin->getIcon(EGDI_CURSOR_DOWN), skin->getColor(isEnabled() ? EGDC_WINDOW_SYMBOL : EGDC_GRAY_WINDOW_SYMBOL));
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core::rect<s32> frameRect(AbsoluteRect);
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// draw the border
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skin->draw3DSunkenPane(this, skin->getColor(EGDC_3D_HIGH_LIGHT),
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true, true, frameRect, &AbsoluteClippingRect);
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// draw children
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IGUIElement::draw();
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}
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void CGUIComboBox::openCloseMenu()
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{
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if (ListBox) {
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// close list box
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Environment->setFocus(this);
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ListBox->remove();
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ListBox = nullptr;
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} else {
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if (Parent) {
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SEvent event;
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event.EventType = EET_GUI_EVENT;
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event.GUIEvent.Caller = this;
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event.GUIEvent.Element = nullptr;
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event.GUIEvent.EventType = EGET_LISTBOX_OPENED;
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// Allow to prevent the listbox from opening.
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if (Parent->OnEvent(event))
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return;
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Parent->bringToFront(this);
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}
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IGUISkin *skin = Environment->getSkin();
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u32 h = Items.size();
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if (h > getMaxSelectionRows())
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h = getMaxSelectionRows();
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if (h == 0)
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h = 1;
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ActiveFont = skin->getFont();
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if (ActiveFont)
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h *= (ActiveFont->getDimension(L"A").Height + 4);
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// open list box
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core::rect<s32> r(0, AbsoluteRect.getHeight(),
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AbsoluteRect.getWidth(), AbsoluteRect.getHeight() + h);
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ListBox = new CGUIListBox(Environment, this, -1, r, false, true, true);
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ListBox->setSubElement(true);
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ListBox->setNotClipped(true);
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ListBox->drop();
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// ensure that list box is always completely visible
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if (ListBox->getAbsolutePosition().LowerRightCorner.Y > Environment->getRootGUIElement()->getAbsolutePosition().getHeight())
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ListBox->setRelativePosition(core::rect<s32>(0, -ListBox->getAbsolutePosition().getHeight(), AbsoluteRect.getWidth(), 0));
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for (s32 i = 0; i < (s32)Items.size(); ++i)
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ListBox->addItem(Items[i].Name.c_str());
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ListBox->setSelected(Selected);
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// set focus
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Environment->setFocus(ListBox);
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}
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}
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} // end namespace gui
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} // end namespace irr
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