scummvm/gui/PopUpWidget.cpp

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/* ScummVM - Graphic Adventure Engine
*
* ScummVM is the legal property of its developers, whose names
* are too numerous to list here. Please refer to the COPYRIGHT
* file distributed with this source distribution.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*
* $URL$
* $Id$
*/
#include "common/system.h"
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#include "common/events.h"
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#include "gui/dialog.h"
#include "gui/GuiManager.h"
#include "gui/PopUpWidget.h"
#include "engines/engine.h"
#include "gui/ThemeEval.h"
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namespace GUI {
//
// PopUpDialog
//
class PopUpDialog : public Dialog {
protected:
PopUpWidget *_popUpBoss;
int _clickX, _clickY;
byte *_buffer;
int _selection;
uint32 _openTime;
bool _twoColumns;
int _entriesPerColumn;
int _leftPadding;
int _rightPadding;
public:
PopUpDialog(PopUpWidget *boss, int clickX, int clickY);
void drawDialog();
void handleMouseUp(int x, int y, int button, int clickCount);
void handleMouseWheel(int x, int y, int direction); // Scroll through entries with scroll wheel
void handleMouseMoved(int x, int y, int button); // Redraw selections depending on mouse position
void handleKeyDown(Common::KeyState state); // Scroll through entries with arrow keys etc.
protected:
void drawMenuEntry(int entry, bool hilite);
int findItem(int x, int y) const;
void setSelection(int item);
bool isMouseDown();
void moveUp();
void moveDown();
};
PopUpDialog::PopUpDialog(PopUpWidget *boss, int clickX, int clickY)
: Dialog(0, 0, 16, 16),
_popUpBoss(boss) {
// Copy the selection index
_selection = _popUpBoss->_selectedItem;
// Calculate real popup dimensions
_x = _popUpBoss->getAbsX();
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_y = _popUpBoss->getAbsY() - _popUpBoss->_selectedItem * kLineHeight;
_h = _popUpBoss->_entries.size() * kLineHeight + 2;
_w = _popUpBoss->_w - kLineHeight + 2;
_leftPadding = _popUpBoss->_leftPadding;
_rightPadding = _popUpBoss->_rightPadding;
// Perform clipping / switch to scrolling mode if we don't fit on the screen
// FIXME - OSystem should send out notification messages when the screen
// resolution changes... we could generalize CommandReceiver and CommandSender.
const int screenH = g_system->getOverlayHeight();
// HACK: For now, we do not do scrolling. Instead, we draw the dialog
// in two columns if it's too tall.
if (_h >= screenH) {
const int screenW = g_system->getOverlayWidth();
_twoColumns = true;
_entriesPerColumn = _popUpBoss->_entries.size() / 2;
if (_popUpBoss->_entries.size() & 1)
_entriesPerColumn++;
_h = _entriesPerColumn * kLineHeight + 2;
_w = 0;
for (uint i = 0; i < _popUpBoss->_entries.size(); i++) {
int width = g_gui.getStringWidth(_popUpBoss->_entries[i].name);
if (width > _w)
_w = width;
}
_w = 2 * _w + 10;
if (!(_w & 1))
_w++;
if (_popUpBoss->_selectedItem >= _entriesPerColumn) {
_x -= _w / 2;
_y = _popUpBoss->getAbsY() - (_popUpBoss->_selectedItem - _entriesPerColumn) * kLineHeight;
}
if (_w >= screenW)
_w = screenW - 1;
if (_x < 0)
_x = 0;
if (_x + _w >= screenW)
_x = screenW - 1 - _w;
} else
_twoColumns = false;
if (_h >= screenH)
_h = screenH - 1;
if (_y < 0)
_y = 0;
else if (_y + _h >= screenH)
_y = screenH - 1 - _h;
// TODO - implement scrolling if we had to move the menu, or if there are too many entries
// Remember original mouse position
_clickX = clickX - _x;
_clickY = clickY - _y;
_openTime = 0;
}
void PopUpDialog::drawDialog() {
// Draw the menu border
g_gui.theme()->drawWidgetBackground(Common::Rect(_x, _y, _x+_w, _y+_h), 0);
/*if (_twoColumns)
g_gui.vLine(_x + _w / 2, _y, _y + _h - 2, g_gui._color);*/
// Draw the entries
int count = _popUpBoss->_entries.size();
for (int i = 0; i < count; i++) {
drawMenuEntry(i, i == _selection);
}
// The last entry may be empty. Fill it with black.
/*if (_twoColumns && (count & 1)) {
g_gui.fillRect(_x + 1 + _w / 2, _y + 1 + kLineHeight * (_entriesPerColumn - 1), _w / 2 - 1, kLineHeight, g_gui._bgcolor);
}*/
if (_openTime == 0) {
// Time the popup was opened
_openTime = g_system->getMillis();
}
}
void PopUpDialog::handleMouseUp(int x, int y, int button, int clickCount) {
// Mouse was released. If it wasn't moved much since the original mouse down,
// let the popup stay open. If it did move, assume the user made his selection.
int dist = (_clickX - x) * (_clickX - x) + (_clickY - y) * (_clickY - y);
if (dist > 3 * 3 || g_system->getMillis() - _openTime > 300) {
setResult(_selection);
close();
}
_clickX = -1;
_clickY = -1;
_openTime = (uint32)-1;
}
void PopUpDialog::handleMouseWheel(int x, int y, int direction) {
if (direction < 0)
moveUp();
else if (direction > 0)
moveDown();
}
void PopUpDialog::handleMouseMoved(int x, int y, int button) {
// Compute over which item the mouse is...
int item = findItem(x, y);
if (item >= 0 && _popUpBoss->_entries[item].name.size() == 0)
item = -1;
if (item == -1 && !isMouseDown()) {
setSelection(_popUpBoss->_selectedItem);
return;
}
// ...and update the selection accordingly
setSelection(item);
}
void PopUpDialog::handleKeyDown(Common::KeyState state) {
if (state.keycode == Common::KEYCODE_ESCAPE) {
// Don't change the previous selection
setResult(-1);
close();
return;
}
if (isMouseDown())
return;
switch (state.keycode) {
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case Common::KEYCODE_RETURN:
case Common::KEYCODE_KP_ENTER:
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setResult(_selection);
close();
break;
// Keypad & special keys
// - if num lock is set, we ignore the keypress
// - if num lock is not set, we fall down to the special key case
case Common::KEYCODE_KP1:
if (state.flags & Common::KBD_NUM)
break;
case Common::KEYCODE_END:
setSelection(_popUpBoss->_entries.size()-1);
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break;
case Common::KEYCODE_KP2:
if (state.flags & Common::KBD_NUM)
break;
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case Common::KEYCODE_DOWN:
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moveDown();
break;
case Common::KEYCODE_KP7:
if (state.flags & Common::KBD_NUM)
break;
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case Common::KEYCODE_HOME:
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setSelection(0);
break;
case Common::KEYCODE_KP8:
if (state.flags & Common::KBD_NUM)
break;
case Common::KEYCODE_UP:
moveUp();
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break;
default:
break;
}
}
int PopUpDialog::findItem(int x, int y) const {
if (x >= 0 && x < _w && y >= 0 && y < _h) {
if (_twoColumns) {
uint entry = (y - 2) / kLineHeight;
if (x > _w / 2) {
entry += _entriesPerColumn;
if (entry >= _popUpBoss->_entries.size())
return -1;
}
return entry;
}
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return (y - 2) / kLineHeight;
}
return -1;
}
void PopUpDialog::setSelection(int item) {
if (item != _selection) {
// Undraw old selection
if (_selection >= 0)
drawMenuEntry(_selection, false);
// Change selection
_selection = item;
// Draw new selection
if (item >= 0)
drawMenuEntry(item, true);
}
}
bool PopUpDialog::isMouseDown() {
// TODO/FIXME - need a way to determine whether any mouse buttons are pressed or not.
// Sure, we could just count mouse button up/down events, but that is cumbersome and
// error prone. Would be much nicer to add an API to OSystem for this...
return false;
}
void PopUpDialog::moveUp() {
if (_selection < 0) {
setSelection(_popUpBoss->_entries.size() - 1);
} else if (_selection > 0) {
int item = _selection;
do {
item--;
} while (item >= 0 && _popUpBoss->_entries[item].name.size() == 0);
if (item >= 0)
setSelection(item);
}
}
void PopUpDialog::moveDown() {
int lastItem = _popUpBoss->_entries.size() - 1;
if (_selection < 0) {
setSelection(0);
} else if (_selection < lastItem) {
int item = _selection;
do {
item++;
} while (item <= lastItem && _popUpBoss->_entries[item].name.size() == 0);
if (item <= lastItem)
setSelection(item);
}
}
void PopUpDialog::drawMenuEntry(int entry, bool hilite) {
// Draw one entry of the popup menu, including selection
assert(entry >= 0);
int x, y, w;
if (_twoColumns) {
int n = _popUpBoss->_entries.size() / 2;
if (_popUpBoss->_entries.size() & 1)
n++;
if (entry >= n) {
x = _x + 1 + _w / 2;
y = _y + 1 + kLineHeight * (entry - n);
} else {
x = _x + 1;
y = _y + 1 + kLineHeight * entry;
}
w = _w / 2 - 1;
} else {
x = _x + 1;
y = _y + 1 + kLineHeight * entry;
w = _w - 2;
}
Common::String &name(_popUpBoss->_entries[entry].name);
if (name.size() == 0) {
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// Draw a separator
g_gui.theme()->drawLineSeparator(Common::Rect(x, y, x+w, y+kLineHeight));
} else {
g_gui.theme()->drawText(Common::Rect(x+1, y+2, x+w, y+2+kLineHeight), name, hilite ? ThemeEngine::kStateHighlight : ThemeEngine::kStateEnabled,
Graphics::kTextAlignLeft, ThemeEngine::kTextInversionNone, _leftPadding);
}
}
#pragma mark -
//
// PopUpWidget
//
PopUpWidget::PopUpWidget(GuiObject *boss, const String &name)
: Widget(boss, name), CommandSender(boss) {
setFlags(WIDGET_ENABLED | WIDGET_CLEARBG | WIDGET_RETAIN_FOCUS | WIDGET_IGNORE_DRAG);
_type = kPopUpWidget;
_selectedItem = -1;
}
void PopUpWidget::handleMouseDown(int x, int y, int button, int clickCount) {
if (isEnabled()) {
PopUpDialog popupDialog(this, x + getAbsX(), y + getAbsY());
int newSel = popupDialog.runModal();
if (newSel != -1 && _selectedItem != newSel) {
_selectedItem = newSel;
sendCommand(kPopUpItemSelectedCmd, _entries[_selectedItem].tag);
}
}
}
void PopUpWidget::handleMouseWheel(int x, int y, int direction) {
int newSelection = _selectedItem + direction;
// Skip separator entries
while ((newSelection >= 0) && (newSelection < (int)_entries.size()) &&
_entries[newSelection].name.equals("")) {
newSelection += direction;
}
// Just update the selected item when we're in range
if ((newSelection >= 0) && (newSelection < (int)_entries.size()) &&
(newSelection != _selectedItem)) {
_selectedItem = newSelection;
draw();
}
}
void PopUpWidget::reflowLayout() {
_leftPadding = g_gui.xmlEval()->getVar("Globals.PopUpWidget.Padding.Left", 0);
_rightPadding = g_gui.xmlEval()->getVar("Globals.PopUpWidget.Padding.Right", 0);
Widget::reflowLayout();
}
void PopUpWidget::appendEntry(const String &entry, uint32 tag) {
Entry e;
e.name = entry;
e.tag = tag;
_entries.push_back(e);
}
void PopUpWidget::clearEntries() {
_entries.clear();
_selectedItem = -1;
}
void PopUpWidget::setSelected(int item) {
if (item != _selectedItem) {
if (item >= 0 && item < (int)_entries.size()) {
_selectedItem = item;
} else {
_selectedItem = -1;
}
}
}
void PopUpWidget::setSelectedTag(uint32 tag) {
uint item;
for (item = 0; item < _entries.size(); ++item) {
if (_entries[item].tag == tag) {
setSelected(item);
return;
}
}
}
void PopUpWidget::drawWidget() {
Common::String sel;
if (_selectedItem >= 0)
sel = _entries[_selectedItem].name;
g_gui.theme()->drawPopUpWidget(Common::Rect(_x, _y, _x + _w, _y + _h), sel, _leftPadding, _state, Graphics::kTextAlignLeft);
}
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} // End of namespace GUI