irrlicht/source/Irrlicht/CGUIComboBox.cpp

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