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+/***************************************************************************
+ *
+ * Copyright (C) 2005 Elad Lahav (elad_lahav@users.sourceforge.net)
+ *
+ * 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 AUTHOR ``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 AUTHOR 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 <qapplication.h>
+#include <qclipboard.h>
+#include <klocale.h>
+#include "queryview.h"
+#include "queryresultsmenu.h"
+#include "queryviewdlg.h"
+#include "cscopefrontend.h"
+#include "searchresultsdlg.h"
+
+/**
+ * Class constructor.
+ * @param	pParent	The parent widget
+ * @param	szName	The name of the widget
+ */
+QueryView::QueryView(QWidget* pParent, const char* szName) :
+	QListView(pParent, szName),
+	m_pLastItem(NULL)
+{
+	// Create the popup-menu
+	m_pQueryMenu = new QueryResultsMenu(this);
+
+	// Initialise the list's columns
+	setAllColumnsShowFocus(true);
+	addColumn(i18n("Function"));
+	addColumn(i18n("File"));
+	addColumn(i18n("Line"));
+	addColumn(i18n("Text"));
+	setColumnAlignment(2, Qt::AlignRight);
+
+	setShowSortIndicator(true);
+	
+	// A record is selected if it is either double-clicked, or the ENTER
+	// key is pressed while the record is highlighted
+	connect(this, SIGNAL(doubleClicked(QListViewItem*)), this, 
+		SLOT(slotRecordSelected(QListViewItem*)));
+	connect(this, SIGNAL(returnPressed(QListViewItem*)), this, 
+		SLOT(slotRecordSelected(QListViewItem*)));
+		
+	// Show the popup-menu when requested
+	connect(this, 
+		SIGNAL(contextMenuRequested(QListViewItem*, const QPoint&, int)),
+		m_pQueryMenu, SLOT(slotShow(QListViewItem*, const QPoint&, int)));
+		
+	// Handle popup-menu commands
+	connect(m_pQueryMenu, SIGNAL(viewSource(QListViewItem*)), this,
+		SLOT(slotRecordSelected(QListViewItem*)));
+	connect(m_pQueryMenu, SIGNAL(findDef(const QString&)), this,
+		SLOT(slotFindDef(const QString&)));
+	connect(m_pQueryMenu, SIGNAL(copy(QListViewItem*, int)), this,
+		SLOT(slotCopy(QListViewItem*, int)));
+	connect(m_pQueryMenu, SIGNAL(filter(int)), this, SLOT(slotFilter(int)));
+	connect(m_pQueryMenu, SIGNAL(showAll()), this, 
+		SLOT(slotShowAll()));
+	connect(m_pQueryMenu, SIGNAL(remove(QListViewItem*)), this,
+		SLOT(slotRemoveItem(QListViewItem*)));
+}
+
+/**
+ * Class destructor.
+ */
+QueryView::~QueryView()
+{
+}
+
+/**
+ * Creates a new list item showing a query result record.
+ * @param	sFunc	The name of the function
+ * @param	sFile	The file path
+ * @param	sLine	The line number in the above file
+ * @param	sText	The line's text
+ * @param	pParent	The parent item (ignored)
+ */
+void QueryView::addRecord(const QString& sFunc, const QString& sFile,
+	const QString& sLine, const QString& sText, QListViewItem* /* pParent */)
+{
+	QListViewItem* pItem;
+	
+	pItem = new QueryViewItem(this, m_pLastItem, 2);
+	pItem->setText(0, sFunc);
+	pItem->setText(1, sFile);
+	pItem->setText(2, sLine);
+	pItem->setText(3, sText);
+	
+	m_pLastItem = pItem;
+}
+
+/**
+ * Selects an item.
+ * When an item is selected, it is highlighted and made visible. By
+ * definition, the lineRequested() signal is also emitted.
+ * This method is used for selecting records programmatically (@see
+ * selectNext() for example). It has nothing to do with user selection.
+ * @param	pItem	The list item to select
+ */
+void QueryView::select(QListViewItem* pItem)
+{
+	ensureItemVisible(pItem);
+	setSelected(pItem, true);
+	slotRecordSelected(pItem);
+}
+
+/**
+ * Selects the next record in the list (if one exists).
+ * The function selects the next item as follows:
+ * - The first item in the list, if there is no current item
+ * - The current item, if it is not selected
+ * - The item immediately below the current item, otherwise
+ */
+void QueryView::selectNext()
+{
+	QListViewItem* pItem;
+	
+	// Do nothing if the list is empty
+	if (firstChild() == NULL)
+		return;
+		
+	// Find the next record
+	pItem = currentItem();
+	if (pItem == NULL) {
+		pItem = firstChild();
+	}
+	else if (pItem->isSelected()) {
+		pItem = pItem->itemBelow();
+		if (pItem == NULL)
+			return;
+	}
+	
+	// Select the new item
+	select(pItem);
+}
+
+/**
+ * Selects the previous record in the list (if one exists).
+ * The function selects the previous item as follows:
+ * - The first item in the list, if there is no current item
+ * - The current item, if it is not selected
+ * - The item immediately above the current item, otherwise
+ */
+void QueryView::selectPrev()
+{
+	QListViewItem* pItem;
+	
+	// Do nothing if the list is empty
+	if (firstChild() == NULL)
+		return;
+	
+	// Find the item immediately above this one
+	pItem = currentItem();
+	if (pItem == NULL) {
+		pItem = firstChild();
+	}
+	else if (pItem->isSelected()) {
+		pItem = pItem->itemAbove();
+		if (pItem == NULL)
+			return;
+	}
+		
+	// Select the new item
+	select(pItem);
+}
+
+/**
+ * Informs the view that query progress information has been received.
+ * The view emits the needToShow() signal telling its parent that the widget
+ * should become visible (if not already so).
+ */
+void QueryView::queryProgress()
+{
+	if (!isVisible())
+		emit needToShow();
+}
+
+/**
+ * Called when a query using this view terminates.
+ * @param	nRecords	Number of records generated by the query
+ */
+void QueryView::queryFinished(uint nRecords, QListViewItem*)
+{
+	// Auto-select a single record (no need to emit the show() signal in
+	// that case)
+	if (nRecords == 1) {
+		emit select(firstChild());
+		return;
+	}
+	
+	// Report a query that has returned an empty record set
+	if (nRecords == 0)
+		addRecord(i18n("No results"), "", "", "", NULL);
+	
+	// Data is available, instruct the owner object to show the view
+	emit needToShow();
+}
+
+/**
+ * Creates an iterator and initialises it to point to the first _visible_
+ * item in the list.
+ * @return	A new iterator initialised to the beginning of the list
+ */
+QueryView::Iterator QueryView::getIterator()
+{
+	QListViewItem* pItem;
+	
+	for (pItem = firstChild(); pItem != NULL && !pItem->isVisible(); 
+		pItem = pItem->nextSibling());
+		
+	return Iterator(pItem);
+}
+
+/**
+ * Handles double-click events over the view.
+ * NOTE: We override this method since the QListView implementation opens
+ * expandable items. This is undesired for tree-like query views (such as the
+ * call tree.
+ * @param	pEvent	Event description object
+ */
+void QueryView::contentsMouseDoubleClickEvent(QMouseEvent* pEvent)
+{
+	QListViewItem* pItem;
+	
+	// Handle only left button double-clicks
+	if (pEvent == NULL || pEvent->button() != LeftButton)
+		return;
+		
+	// Find the clicked item
+	pItem = itemAt(contentsToViewport(pEvent->pos()));
+	if (pItem == NULL)
+		return;
+		
+	// Emit the doubleClicked() signal
+	emit doubleClicked(pItem);
+}
+
+/**
+ * Emits the lineRequested() signal when a list item is selected.
+ * This slot is connected to the doubleClicked() and returnPressed()
+ * signals of the list view.
+ * @param	pItem	The selected item
+ */
+void QueryView::slotRecordSelected(QListViewItem* pItem)
+{
+	QString sFileName, sLine;
+
+	// Get the file name and line number
+	sFileName = pItem->text(1);
+	sLine = pItem->text(2);
+
+	// Do not process the "No results" item
+	if (!sLine.isEmpty())
+		emit lineRequested(sFileName, sLine.toUInt());
+}
+
+/**
+ * Looks up the definition of a given function.
+ * Results are displayed in a popup window.
+ * This slot is connected to the findDef() signal emitted by the results menu.
+ * @param	sFunc	The function to look for
+ */
+void QueryView::slotFindDef(const QString& sFunc)
+{
+	QueryViewDlg* pDlg;
+	
+	// Create a query view dialogue
+	pDlg = new QueryViewDlg(QueryViewDlg::DestroyOnSelect, this);
+	
+	// Display a line when it is selected in the dialogue
+	connect(pDlg, SIGNAL(lineRequested(const QString&, uint)), this,
+		SIGNAL(lineRequested(const QString&, uint)));
+		
+	// Start the query
+	pDlg->query(CscopeFrontend::Definition, sFunc);
+}
+
+/**
+ * Copies the text of the requested field (item+column) to the clipboard.
+ * This slot is connected to the copy() signal of the QueryResultsMenu object.
+ * @param	pItem	The item from which to copy
+ * @param	nCol	The index of the item field to copy
+ */
+void QueryView::slotCopy(QListViewItem* pItem, int nCol)
+{
+	QApplication::clipboard()->setText(pItem->text(nCol),
+		QClipboard::Clipboard);
+}
+
+/**
+ * Hides all items in the page that do not meet the given search criteria.
+ * This slot is connected to the search() signal of the QueryResultsMenu
+ * object.
+ * The search is incremental: only visible items are checked, so that a new
+ * search goes over the results of the previous one.
+ * @param	nCol	The list column to search in
+ */
+void QueryView::slotFilter(int nCol)
+{
+	SearchResultsDlg dlg(this);
+	QRegExp re;
+	QListViewItem* pItem;
+	bool bNegate;
+	
+	// Prepare the dialogue
+	dlg.setColumn(nCol);
+	
+	// Show the dialogue
+	if (dlg.exec() != QDialog::Accepted)
+		return;
+		
+	// Get the selected regular expression
+	dlg.getPattern(re);
+	bNegate = dlg.isNegated();
+	
+	// Disable visual updates while search is in progress
+	setUpdatesEnabled(false);
+	
+	// Iterate over all items in the list
+	pItem = firstChild();
+	while (pItem != NULL) {
+		// Filter visible items only
+		if (pItem->isVisible() &&
+			(re.search(pItem->text(nCol)) == -1) != bNegate) {
+			pItem->setVisible(false);
+		}
+		
+		pItem = pItem->nextSibling();
+	}
+	
+	// Redraw the list
+	setUpdatesEnabled(true);
+	triggerUpdate();
+}
+
+/**
+ * Makes all list items visible.
+ * This slot is connected to the showAll() signal of the QueryResultsMenu
+ * object.
+ */
+void QueryView::slotShowAll()
+{
+	QListViewItem* pItem;
+	
+	// Iterate over all items in the list
+	pItem = firstChild();
+	while (pItem != NULL) {
+		pItem->setVisible(true);
+		pItem = pItem->nextSibling();
+	}
+}
+
+/**
+ * Deletes the item on which a popup-menu has been invoked.
+ * This slot is connected to the remove() signal of the QueryResultsMenu
+ * object.
+ * @param	pItem	The item to remove
+ */
+void QueryView::slotRemoveItem(QListViewItem* pItem)
+{
+	delete pItem;
+}
+
+/**
+ * Moves the iterator to the next _visible_ item in the list.
+ */
+void QueryView::Iterator::next()
+{
+	if (m_pItem == NULL)
+		return;
+		
+	do {
+		m_pItem = m_pItem->nextSibling();
+	} while (m_pItem != NULL && !m_pItem->isVisible());
+}
+
+/**
+ * @return	The function associated with the list item the iterator points to
+ */
+QString QueryView::Iterator::getFunc()
+{
+	if (m_pItem == NULL)
+		return "";
+		
+	return m_pItem->text(0);
+}
+
+/**
+ * @return	The file associated with the list item the iterator points to
+ */
+QString QueryView::Iterator::getFile()
+{
+	if (m_pItem == NULL)
+		return "";
+		
+	return m_pItem->text(1);
+}
+
+/**
+ * @return	The line number associated with the list item the iterator points
+ *			to
+ */
+QString QueryView::Iterator::getLine()
+{
+	if (m_pItem == NULL)
+		return "";
+		
+	return m_pItem->text(2);
+}
+
+/**
+ * @return	The text associated with the list item the iterator points to
+ */
+QString QueryView::Iterator::getText()
+{
+	if (m_pItem == NULL)
+		return "";
+		
+	return m_pItem->text(3);
+}
+
+#include "queryview.moc"