Quick implementation of text selection (note: text is printed to stderr):

- KPDFPage: added a method to retrieve the text that is inside a rect from
    the embedded TextPage.
- PageWidget: (GFX) added methods to set the 1st (placed on click) and 2nd
    (placed on drag) corners of the selection area.
- PageView: A) set first corner on click, B) second on moves, C) retrieve
    text inside the rectangle on release.

svn path=/branches/kpdf_experiments/kdegraphics/kpdf/; revision=352751

kpdf/page.cpp

@@ -55,7 +55,15 @@ bool KPDFPage::hasPixmap( int id, int width, int height ) const
 
 bool KPDFPage::hasSearchPage() const
 {
-    return (m_text != 0);
+    return ( m_text != 0 );
+}
+
+QString KPDFPage::getTextInRect( const QRect & rect ) const
+{
+    if ( !m_text )
+        return QString();
+    GString * text = m_text->getText( rect.left(), rect.top(), rect.right(), rect.bottom() );
+    return QString( text->getCString() );
 }
 
 bool KPDFPage::hasLink( int mouseX, int mouseY ) const

kpdf/page.h

@@ -44,6 +44,7 @@ public:
     bool isBookmarked() const { return m_bookmarking; }
     bool hasPixmap( int id, int width, int height ) const;
     bool hasSearchPage() const;
+    QString getTextInRect( const QRect & rect ) const;
     bool hasLink( int mouseX, int mouseY ) const;
     const KPDFLink * getLink( int mouseX, int mouseY ) const;
     void drawPixmap( int id, QPainter * p, const QRect & rect, int width, int height ) const;

kpdf/pageview.cpp

@@ -56,6 +56,7 @@ public:
     QPoint mouseGrabPos;
     QPoint mouseStartPos;
     bool mouseOnLink;
+    PageWidget * mouseSelectionWidget;
 
     // other stuff
     QTimer *delayTimer;
@@ -97,6 +98,7 @@ PageView::PageView( QWidget *parent, KPDFDocument *document )
     d->zoomFactor = 1.0;
     d->mouseMode = MouseNormal;
     d->mouseOnLink = false;
+    d->mouseSelectionWidget = 0;
     d->delayTimer = 0;
     d->scrollTimer = 0;
     d->scrollIncrement = 0;
@@ -292,7 +294,19 @@ void PageView::contentsMousePressEvent( QMouseEvent * e )
             emit rightClick();
         break;
 
-    case MouseSelection: // ? set 1st corner of the selection rect ?
+    case MouseSelection: // set first corner of the selection rect
+        if ( leftButton )
+        {
+            if ( d->mouseSelectionWidget )
+                d->mouseSelectionWidget->clearSelection();
+            d->mouseSelectionWidget = 0;
+            PageWidget * page = pickPageOnPoint( e->x(), e->y() );
+            if ( page )
+            {
+                page->setBeginCorner( e->x() - childX( page ), e->y() - childY( page ) );
+                d->mouseSelectionWidget = page;
+            }
+        }
         break;
 
     case MouseEdit:      // ? place the beginning of [tool] ?
@@ -300,6 +314,7 @@ void PageView::contentsMousePressEvent( QMouseEvent * e )
     }
 }
 
+#include <kdebug.h>
 void PageView::contentsMouseReleaseEvent( QMouseEvent * e )
 {
     bool leftButton = e->button() & LeftButton,
@@ -356,7 +371,14 @@ void PageView::contentsMouseReleaseEvent( QMouseEvent * e )
         }
         break;
 
-    case MouseSelection: // ? d->page->setPixmapOverlaySelection( QRect ) ?
+    case MouseSelection: // get text from the page
+        if ( leftButton && d->mouseSelectionWidget )
+        {
+            kdWarning() << d->mouseSelectionWidget->selectedText() << endl;
+            d->mouseSelectionWidget->clearSelection();
+            d->mouseSelectionWidget = 0;
+        }
+        break;
 
     case MouseEdit:      // ? apply [tool] ?
         break;
@@ -390,7 +412,13 @@ void PageView::contentsMouseMoveEvent( QMouseEvent * e )
         }
         break;
 
-    case MouseSelection: // ? update selection contour ?
+    case MouseSelection: // set selection's second corner
+        if ( leftButton && d->mouseSelectionWidget )
+            // continue selecting on current page
+            d->mouseSelectionWidget->setEndCorner(
+                e->x() - childX( d->mouseSelectionWidget ),
+                e->y() - childY( d->mouseSelectionWidget ) );
+        break;
 
     case MouseEdit:      // ? update graphics ?
         break;

kpdf/pixmapwidget.cpp

@@ -131,12 +131,49 @@ void ThumbnailWidget::paintEvent( QPaintEvent * e )
 /** PageWidget **/
 
 PageWidget::PageWidget( QWidget *parent, const KPDFPage *page )
-    : PixmapWidget( parent, page )
+    : PixmapWidget( parent, page ), m_selBeginX( -1 ), m_selBeginY( -1 )
 {
     // keep bottom equal to right margin
     setPixmapMargins( 1, 1, 4, 4 );
 }
 
+void PageWidget::clearSelection()
+{
+    if ( !m_selectionRect.isNull() )
+        update( m_selectionRect );
+    m_selBeginX = -1;
+    m_selBeginY = -1;
+    m_selectionRect = QRect();
+}
+
+void PageWidget::setBeginCorner( int x, int y )
+{
+    if ( !m_selectionRect.isNull() )
+        update( m_selectionRect );
+    m_selBeginX = x;
+    m_selBeginY = y;
+    m_selectionRect.setCoords( x, y, 1, 1 );
+    update( m_selectionRect );
+}
+
+void PageWidget::setEndCorner( int x, int y )
+{
+    QRect newRect( m_selBeginX, m_selBeginY, x - m_selBeginX, y - m_selBeginY );
+    newRect = newRect.normalize().intersect( QRect( m_marginLeft, m_marginTop, m_pixmapWidth, m_pixmapHeight ) );
+    if ( newRect != m_selectionRect )
+    {
+        if ( !m_selectionRect.isNull() )
+            update( m_selectionRect );
+        m_selectionRect = newRect;
+        update( m_selectionRect );
+    }
+}
+
+QString PageWidget::selectedText() const
+{
+    return m_page->getTextInRect( m_selectionRect );
+}
+
 void PageWidget::paintEvent( QPaintEvent * e )
 {
     QRect clip = e->rect();
@@ -183,5 +220,13 @@ void PageWidget::paintEvent( QPaintEvent * e )
 #endif
     p.translate( -m_marginLeft, -m_marginTop );
 
+    // draw selection rect (uses opaque selection)
+    if ( !m_selectionRect.isNull() )
+    {
+        p.setPen( palette().active().highlight().dark(110) );
+        //COOL p.setBrush( QBrush( palette().active().highlight(), Qt::Dense4Pattern ) );
+        p.drawRect( m_selectionRect );
+    }
+
     p.end();
 }

kpdf/pixmapwidget.h

@@ -12,6 +12,7 @@
 #define _PIXMAPWIDGET_H_
 
 #include <qwidget.h>
+#include <qrect.h>
 
 class KPDFPage;
 
@@ -73,7 +74,7 @@ private:
 
 
 /**
- * @short PageView's editable page. Renders page, outline and overlay GFX.
+ * @short PageView's editable page. Renders page, selection and overlay GFX.
  * ...
  */
 class PageWidget : public PixmapWidget
@@ -81,8 +82,18 @@ class PageWidget : public PixmapWidget
 public:
     PageWidget( QWidget * parent, const KPDFPage * page );
 
+    void clearSelection();
+    void setBeginCorner( int x, int y );
+    void setEndCorner( int x, int y );
+    QString selectedText() const;
+
 protected:
     void paintEvent(QPaintEvent *);
+
+private:
+    int m_selBeginX;
+    int m_selBeginY;
+    QRect m_selectionRect;
 };
 
 #endif