added the image-display widgets to lib 'cause it may used in other

applications
ToDo: Interface description

1 files changed, 233 insertions, 0 deletions

diff --git a/libopie2/opiemm/oimagezoomer.cpp b/libopie2/opiemm/oimagezoomer.cpp
new file mode 100644
index 0000000..d1eec67
--- a/dev/null
+++ b/libopie2/opiemm/oimagezoomer.cpp
@@ -0,0 +1,233 @@
+#include "oimagezoomer.h"
+
+#include <opie2/odebug.h>
+
+#include <qimage.h>
+#include <qpixmap.h>
+#include <qpainter.h>
+#include <qrect.h>
+#include <qpoint.h>
+#include <qsize.h>
+
+namespace Opie {
+namespace MM {
+
+/**
+ * \brief The most simple c'tor
+ * The main c'tor. You still need to set a QPixmap/QIMage,
+ *  setImageSize,setViewPortSize,setVisiblePoint
+ *
+ * @param parent The parent widget
+ * @param name A name for this widget
+ * @param fl The widget flags
+ *
+ */
+OImageZoomer::OImageZoomer( QWidget* parent,  const char* name,  WFlags fl )
+    :  QFrame( parent, name, fl ) {
+    init();
+}
+
+
+/**
+ * \brief This c'tor takes a QPixmap additional
+ *
+ * You initially set the QPixmap but you still need to provide
+ * the additional data to make this widget useful
+ *
+ * @param pix A Pixmap it'll be converted to a QImage later!
+ * @param par The parent widget
+ * @param name The name of this widget
+ * @param fl The widget flags
+ */
+OImageZoomer::OImageZoomer( const QPixmap& pix, QWidget* par, const char* name, WFlags fl )
+    : QFrame( par, name, fl ) {
+    init();
+    setImage( pix );
+}
+
+
+/**
+ * \brief This c'tor takes a QImage instead
+ * You just provide a QImage which is saved. It behaves the same as the others.
+ *
+ * @param img A Image which will be used for the zoomer content
+ * @param par The  parent of the widget
+ * @param name The name of the widget
+ * @param fl The widgets flags
+ */
+OImageZoomer::OImageZoomer( const QImage& img, QWidget* par, const char* name,  WFlags fl)
+    : QFrame( par, name, fl ) {
+    init();
+    setImage( img );
+}
+
+
+/**
+ * \brief overloaded c'tor
+ *
+ * This differs only in the arguments it takes
+ *
+ *
+ * @param pSize The size of the Page you show
+ * @param vSize The size of the viewport. The size of the visible part of the widget
+ * @param par The parent of the widget
+ * @param name The name
+ * @param fl The window flags
+ */
+OImageZoomer::OImageZoomer( const QSize& pSize, const QSize& vSize, QWidget* par,
+                            const char* name, WFlags fl )
+    : QFrame( par, name, fl ), m_imgSize( pSize ),m_visSize( vSize ) {
+    init();
+}
+
+/**
+ * d'tor
+ */
+OImageZoomer::~OImageZoomer() {
+
+}
+
+void OImageZoomer::init() {
+    m_mevent = false;
+    setFrameStyle( Panel | Sunken );
+}
+
+
+/**
+ * \brief set the page/image size
+ * Tell us the QSize of the Data you show to the user. We need this
+ * to do the calculations
+ *
+ * @param size The size of the stuff you want to zoom on
+ */
+void OImageZoomer::setImageSize( const QSize& size ) {
+    m_imgSize = size;
+    repaint();
+}
+
+/**
+ * \brief Set the size of the viewport
+ * Tell us the QSize of the viewport. The viewport is the part
+ * of the widget which is exposed on the screen
+ *
+ * @param size Te size of the viewport
+ *
+ * @see QScrollView::viewport()
+ */
+void OImageZoomer::setViewPortSize( const QSize& size ) {
+    m_visSize = size;
+    repaint();
+}
+
+/**
+ * \brief the point in the topleft corner which is currently visible
+ * Set the visible point. This most of the times relate to QScrollView::contentsX()
+ * and QScrollView::contentsY()
+ *
+ * @see setVisiblePoint(int,int)
+ */
+void OImageZoomer::setVisiblePoint( const QPoint& pt ) {
+    m_visPt = pt;
+    repaint();
+}
+
+
+/**
+ * Set the Image. The image will be resized on resizeEvent
+ * and it'll set the QPixmap background
+ *
+ * @param img The image will be stored internally and used as the background
+ */
+void OImageZoomer::setImage( const QImage& img) {
+    m_img = img;
+    resizeEvent( 0 );
+    repaint();
+}
+
+/**
+ * overloaded function it calls the QImage version
+ */
+void OImageZoomer::setImage( const QPixmap& pix) {
+    setImage( pix.convertToImage() );
+}
+
+void OImageZoomer::resizeEvent( QResizeEvent* ev ) {
+    QFrame::resizeEvent( ev );
+    setBackgroundOrigin(  QWidget::WidgetOrigin );
+    // TODO Qt3 use PalettePixmap and use size
+    QPixmap pix; pix.convertFromImage( m_img.smoothScale( size().width(), size().height() ) );
+    setBackgroundPixmap( pix);
+}
+
+void OImageZoomer::drawContents( QPainter* p ) {
+    /*
+     * if the page size
+     */
+    if ( m_imgSize.isEmpty() )
+        return;
+
+   /*
+    * paint a red rect which represents the visible size
+    *
+    * We need to recalculate x,y and width and height of the
+    * rect. So image size relates to contentRect
+    *
+    */
+    QRect c( contentsRect() );
+    p->setPen( Qt::red );
+
+    /*
+     * the contentRect is set equal to the size of the image
+     * Rect/Original = NewRectORWidth/OriginalVisibleStuff and then simply we
+     * need to add the c.y/x due usage of QFrame
+     * For x and y we use the visiblePoint
+     * For height and width we use the size of the viewport
+     * if width/height would be bigger than our widget we use this width/height
+     *
+     */
+    int len = m_imgSize.width();
+    int x = (c.width()*m_visPt.x())/len        + c.x();
+    int w = (c.width()*m_visSize.width() )/len + c.x();
+    if ( w > c.width() ) w = c.width();
+
+    len = m_imgSize.height();
+    int y = (c.height()*m_visPt.y() )/len          + c.y();
+    int h = (c.height()*m_visSize.height() )/len + c.y();
+    if ( h > c.height() ) h = c.height();
+
+    p->drawRect( x, y, w, h );
+}
+
+void OImageZoomer::mousePressEvent( QMouseEvent*ev) {
+    m_mouseX = m_mouseY = -1;
+    m_mevent = true;
+}
+
+void OImageZoomer::mouseReleaseEvent( QMouseEvent*ev) {
+    if (!m_mevent) return;
+    int mx, my;
+    mx = ev->x();
+    my = ev->y();
+    int diffx = (mx) * m_imgSize.width() / width();
+    int diffy = (my) * m_imgSize.height() / height();
+    emit zoomArea(diffx,diffy);
+}
+
+void OImageZoomer::mouseMoveEvent( QMouseEvent* ev ) {
+    int mx, my;
+    mx = ev->x();
+    my = ev->y();
+
+    if ( m_mouseX != -1 && m_mouseY != -1 ) {
+        m_mevent = false;
+        int diffx = ( mx - m_mouseX ) * m_imgSize.width() / width();
+        int diffy = ( my - m_mouseY ) * m_imgSize.height() / height();
+        emit zoomAreaRel( diffx, diffy );
+    }
+    m_mouseX = mx;
+    m_mouseY = my;
+}
+
+
+}
+}