File indexing completed on 2024-05-05 04:21:19

 
 /*
    Copyright (c) 2003-2007 Clarence Dang <dang@kde.org>
    Copyright (c) 2005 Kazuki Ohta <mover@hct.zaq.ne.jp>
    Copyright (c) 2010 Tasuku Suzuki <stasuku@gmail.com>
    All rights reserved.
 
    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.
 */
 
 
 #define DEBUG_KP_VIEW 0
 #define DEBUG_KP_VIEW_RENDERER ((DEBUG_KP_VIEW && 1) || 0)
 
 
 #include "kpView.h"
 #include "kpViewPrivate.h"
 
 #include <cstdlib>
 
 #include <QCursor>
 #include <QPoint>
 #include <QRect>
 #include <QRegion>
 #include <QScrollBar>
 
 #include "kpLogCategories.h"
 
 #include "document/kpDocument.h"
 #include "layers/selections/text/kpTextSelection.h"
 #include "tools/kpTool.h"
 #include "widgets/toolbars/kpToolToolBar.h"
 #include "views/manager/kpViewManager.h"
 #include "kpViewScrollableContainer.h"
 
 //---------------------------------------------------------------------
 
 // public static
 const int kpView::MinZoomLevel = 1;
 const int kpView::MaxZoomLevel = 20000;
 
 //---------------------------------------------------------------------
 
 kpView::kpView (kpDocument *document,
         kpToolToolBar *toolToolBar,
         kpViewManager *viewManager,
         kpView *buddyView,
         kpViewScrollableContainer *scrollableContainer,
         QWidget *parent)
     : QWidget (parent),
       d (new kpViewPrivate ())
 {
     d->document = document;
     d->toolToolBar = toolToolBar;
     d->viewManager = viewManager;
     d->buddyView = buddyView;
     d->scrollableContainer = scrollableContainer;
 
     d->hzoom = 100;
     d->vzoom = 100;
     d->origin = QPoint (0, 0);
     d->showGrid = false;
     d->isBuddyViewScrollableContainerRectangleShown = false;
 
     // Don't waste CPU drawing default background since its overridden by
     // our fully opaque drawing.  In reality, this seems to make no
     // difference in performance.
     setAttribute(Qt::WA_OpaquePaintEvent, true);
 
     setFocusPolicy (Qt::WheelFocus);
     setMouseTracking (true);  // mouseMoveEvent's even when no mousebtn down
     setAttribute (Qt::WA_KeyCompression, true);
 }
 
 //---------------------------------------------------------------------
 
 kpView::~kpView ()
 {
     setHasMouse (false);
 
     delete d;
 }
 
 //---------------------------------------------------------------------
 
 // public
 kpDocument *kpView::document () const
 {
     return d->document;
 }
 
 //---------------------------------------------------------------------
 
 // protected
 kpAbstractSelection *kpView::selection () const
 {
     return document () ? document ()->selection () : nullptr;
 }
 
 //---------------------------------------------------------------------
 
 // protected
 kpTextSelection *kpView::textSelection () const
 {
     return document () ? document ()->textSelection () : nullptr;
 }
 
 //---------------------------------------------------------------------
 
 // public
 kpToolToolBar *kpView::toolToolBar () const
 {
     return d->toolToolBar;
 }
 
 // protected
 kpTool *kpView::tool () const
 {
     return toolToolBar () ? toolToolBar ()->tool () : nullptr;
 }
 
 // public
 kpViewManager *kpView::viewManager () const
 {
     return d->viewManager;
 }
 
 // public
 kpView *kpView::buddyView () const
 {
     return d->buddyView;
 }
 
 // public
 kpViewScrollableContainer *kpView::buddyViewScrollableContainer () const
 {
     return (buddyView () ? buddyView ()->scrollableContainer () : nullptr);
 }
 
 // public
 kpViewScrollableContainer *kpView::scrollableContainer () const
 {
     return d->scrollableContainer;
 }
 
 
 // public
 int kpView::zoomLevelX () const
 {
     return d->hzoom;
 }
 
 // public
 int kpView::zoomLevelY () const
 {
     return d->vzoom;
 }
 
 // public virtual
 void kpView::setZoomLevel (int hzoom, int vzoom)
 {
     hzoom = qBound (MinZoomLevel, hzoom, MaxZoomLevel);
     vzoom = qBound (MinZoomLevel, vzoom, MaxZoomLevel);
 
     if (hzoom == d->hzoom && vzoom == d->vzoom) {
         return;
     }
 
     d->hzoom = hzoom;
     d->vzoom = vzoom;
 
     if (viewManager ()) {
         viewManager ()->updateView (this);
     }
 
     Q_EMIT zoomLevelChanged (hzoom, vzoom);
 }
 
 
 // public
 QPoint kpView::origin () const
 {
     return d->origin;
 }
 
 // public virtual
 void kpView::setOrigin (const QPoint &origin)
 {
 #if DEBUG_KP_VIEW
     qCDebug(kpLogViews) << "kpView(" << objectName () << ")::setOrigin" << origin;
 #endif
 
     if (origin == d->origin)
     {
     #if DEBUG_KP_VIEW
         qCDebug(kpLogViews) << "\tNOP";
     #endif
         return;
     }
 
     d->origin = origin;
 
     if (viewManager ()) {
         viewManager ()->updateView (this);
     }
 
     Q_EMIT originChanged (origin);
 }
 
 
 // public
 bool kpView::canShowGrid () const
 {
     // (minimum zoom level < 400% would probably be reported as a bug by
     //  users who thought that the grid was a part of the image!)
     return ((zoomLevelX () >= 400 && zoomLevelX () % 100 == 0) &&
             (zoomLevelY () >= 400 && zoomLevelY () % 100 == 0));
 }
 
 // public
 bool kpView::isGridShown () const
 {
     return d->showGrid;
 }
 
 // public
 void kpView::showGrid (bool yes)
 {
     if (d->showGrid == yes) {
         return;
     }
 
     if (yes && !canShowGrid ()) {
         return;
     }
 
     d->showGrid = yes;
 
     if (viewManager ()) {
         viewManager ()->updateView (this);
     }
 }
 
 
 // public
 bool kpView::isBuddyViewScrollableContainerRectangleShown () const
 {
     return d->isBuddyViewScrollableContainerRectangleShown;
 }
 
 // public
 void kpView::showBuddyViewScrollableContainerRectangle (bool yes)
 {
     if (yes == d->isBuddyViewScrollableContainerRectangleShown) {
         return;
     }
 
     d->isBuddyViewScrollableContainerRectangleShown = yes;
 
     if (d->isBuddyViewScrollableContainerRectangleShown)
     {
         // Got these connect statements by analysing deps of
         // updateBuddyViewScrollableContainerRectangle() rect update code.
 
         connect (this, &kpView::zoomLevelChanged,
                  this, &kpView::updateBuddyViewScrollableContainerRectangle);
 
         connect (this, &kpView::originChanged,
                  this, &kpView::updateBuddyViewScrollableContainerRectangle);
 
         if (buddyViewScrollableContainer ())
         {
             connect (buddyViewScrollableContainer (),
                      &kpViewScrollableContainer::contentsMoved,
                      this, &kpView::updateBuddyViewScrollableContainerRectangle);
 
             connect (buddyViewScrollableContainer (), &kpViewScrollableContainer::resized,
                      this, &kpView::updateBuddyViewScrollableContainerRectangle);
         }
 
         if (buddyView ())
         {
             connect (buddyView (), &kpView::zoomLevelChanged,
                      this, &kpView::updateBuddyViewScrollableContainerRectangle);
 
             connect (buddyView (), &kpView::originChanged,
                      this, &kpView::updateBuddyViewScrollableContainerRectangle);
 
             connect (buddyView (),
                      static_cast<void (kpView::*)(int,int)>(&kpView::sizeChanged),
                      this, &kpView::updateBuddyViewScrollableContainerRectangle);
         }
 
     }
     else
     {
         disconnect (this, &kpView::zoomLevelChanged,
                     this, &kpView::updateBuddyViewScrollableContainerRectangle);
 
         disconnect (this, &kpView::originChanged,
                  this, &kpView::updateBuddyViewScrollableContainerRectangle);
 
         if (buddyViewScrollableContainer ())
         {
             disconnect (buddyViewScrollableContainer (),
                      &kpViewScrollableContainer::contentsMoved,
                      this, &kpView::updateBuddyViewScrollableContainerRectangle);
 
             disconnect (buddyViewScrollableContainer (), &kpViewScrollableContainer::resized,
                      this, &kpView::updateBuddyViewScrollableContainerRectangle);
         }
 
         if (buddyView ())
         {
             disconnect (buddyView (), &kpView::zoomLevelChanged,
                      this, &kpView::updateBuddyViewScrollableContainerRectangle);
 
             disconnect (buddyView (), &kpView::originChanged,
                      this, &kpView::updateBuddyViewScrollableContainerRectangle);
 
             disconnect (buddyView (),
                      static_cast<void (kpView::*)(int,int)>(&kpView::sizeChanged),
                      this, &kpView::updateBuddyViewScrollableContainerRectangle);
         }
 
     }
 
     updateBuddyViewScrollableContainerRectangle ();
 }
 
 
 // protected
 QRect kpView::buddyViewScrollableContainerRectangle () const
 {
     return d->buddyViewScrollableContainerRectangle;
 }
 
 // protected slot
 void kpView::updateBuddyViewScrollableContainerRectangle ()
 {
     if (viewManager ()) {
         viewManager ()->setQueueUpdates ();
     }
 
     {
         if (d->buddyViewScrollableContainerRectangle.isValid ())
         {
             if (viewManager ())
             {
                 // Erase last
                 viewManager ()->updateViewRectangleEdges (this,
                     d->buddyViewScrollableContainerRectangle);
             }
         }
 
 
         QRect newRect;
         if (isBuddyViewScrollableContainerRectangleShown () &&
             buddyViewScrollableContainer () && buddyView ())
         {
             QRect docRect = buddyView ()->transformViewToDoc (
                 QRect (buddyViewScrollableContainer ()->horizontalScrollBar()->value(),
                        buddyViewScrollableContainer ()->verticalScrollBar()->value(),
                        qMin (buddyView ()->width (),
                              buddyViewScrollableContainer ()->viewport()->width ()),
                        qMin (buddyView ()->height (),
                              buddyViewScrollableContainer ()->viewport()->height ())));
 
 
             QRect viewRect = this->transformDocToView (docRect);
 
 
             // (Surround the area of interest by moving outwards by 1 pixel in each
             //  direction - don't overlap area)
             newRect = QRect (viewRect.x () - 1,
                              viewRect.y () - 1,
                              viewRect.width () + 2,
                              viewRect.height () + 2);
         }
         else
         {
             newRect = QRect ();
         }
 
         if (newRect != d->buddyViewScrollableContainerRectangle)
         {
             // (must set before updateView() for paintEvent() to see new
             //  rect)
             d->buddyViewScrollableContainerRectangle = newRect;
 
             if (newRect.isValid ())
             {
                 if (viewManager ())
                 {
                     viewManager ()->updateViewRectangleEdges (this,
                         d->buddyViewScrollableContainerRectangle);
                 }
             }
         }
     }
 
     if (viewManager ()) {
         viewManager ()->restoreQueueUpdates ();
     }
 }
 
 //---------------------------------------------------------------------
 
 // public
 double kpView::transformViewToDocX (double viewX) const
 {
     return (viewX - origin ().x ()) * 100.0 / zoomLevelX ();
 }
 
 //---------------------------------------------------------------------
 
 // public
 double kpView::transformViewToDocY (double viewY) const
 {
     return (viewY - origin ().y ()) * 100.0 / zoomLevelY ();
 }
 
 //---------------------------------------------------------------------
 
 // public
 QPoint kpView::transformViewToDoc (const QPoint &viewPoint) const
 {
     return  {static_cast<int> (transformViewToDocX (viewPoint.x ())),
                    static_cast<int> (transformViewToDocY (viewPoint.y ()))};
 }
 
 //---------------------------------------------------------------------
 
 // public
 QRect kpView::transformViewToDoc (const QRect &viewRect) const
 {
     if (zoomLevelX () == 100 && zoomLevelY () == 100)
     {
         return  {viewRect.x () - origin ().x (), viewRect.y () - origin ().y (),
                     viewRect.width (), viewRect.height ()};
     }
 
     const QPoint docTopLeft = transformViewToDoc (viewRect.topLeft ());
 
     // (don't call transformViewToDoc[XY]() - need to round up dimensions)
     const auto docWidth = qRound (double (viewRect.width ()) * 100.0 / double (zoomLevelX ()));
     const auto docHeight = qRound (double (viewRect.height ()) * 100.0 / double (zoomLevelY ()));
 
     // (like QWMatrix::Areas)
     return  {docTopLeft.x (), docTopLeft.y (), docWidth, docHeight};
 
 }
 
 //---------------------------------------------------------------------
 
 // public
 double kpView::transformDocToViewX (double docX) const
 {
     return (docX * zoomLevelX () / 100.0) + origin ().x ();
 }
 
 // public
 double kpView::transformDocToViewY (double docY) const
 {
     return (docY * zoomLevelY () / 100.0) + origin ().y ();
 }
 
 // public
 QPoint kpView::transformDocToView (const QPoint &docPoint) const
 {
     return  {static_cast<int> (transformDocToViewX (docPoint.x ())),
                 static_cast<int> (transformDocToViewY (docPoint.y ()))};
 }
 
 // public
 QRect kpView::transformDocToView (const QRect &docRect) const
 {
     if (zoomLevelX () == 100 && zoomLevelY () == 100)
     {
         return  {docRect.x () + origin ().x (), docRect.y () + origin ().y (),
                     docRect.width (), docRect.height ()};
     }
 
     const QPoint viewTopLeft = transformDocToView (docRect.topLeft ());
 
     // (don't call transformDocToView[XY]() - need to round up dimensions)
     const int viewWidth = qRound (double (docRect.width ()) * double (zoomLevelX ()) / 100.0);
     const int viewHeight = qRound (double (docRect.height ()) * double (zoomLevelY ()) / 100.0);
 
     // (like QWMatrix::Areas)
     return QRect (viewTopLeft.x (), viewTopLeft.y (), viewWidth, viewHeight);
 }
 
 
 // public
 QPoint kpView::transformViewToOtherView (const QPoint &viewPoint,
                                          const kpView *otherView)
 {
     if (this == otherView) {
         return viewPoint;
     }
 
     const double docX = transformViewToDocX (viewPoint.x ());
     const double docY = transformViewToDocY (viewPoint.y ());
 
     const double otherViewX = otherView->transformDocToViewX (docX);
     const double otherViewY = otherView->transformDocToViewY (docY);
 
     return  {static_cast<int> (otherViewX), static_cast<int> (otherViewY)};
 }
 
 
 // public
 int kpView::zoomedDocWidth () const
 {
     return document () ? document ()->width () * zoomLevelX () / 100 : 0;
 }
 
 // public
 int kpView::zoomedDocHeight () const
 {
     return document () ? document ()->height () * zoomLevelY () / 100 : 0;
 }
 
 
 // public
 void kpView::setHasMouse (bool yes)
 {
     kpViewManager *vm = viewManager ();
     if (!vm) {
         return;
     }
 
 #if DEBUG_KP_VIEW && 0
     qCDebug(kpLogViews) << "kpView(" << objectName ()
                << ")::setHasMouse(" << yes
                << ") existing viewUnderCursor="
                << (vm->viewUnderCursor () ? vm->viewUnderCursor ()->objectName () : "(none)");
 #endif
     if (yes && vm->viewUnderCursor () != this) {
         vm->setViewUnderCursor (this);
     }
     else if (!yes && vm->viewUnderCursor () == this) {
         vm->setViewUnderCursor (nullptr);
     }
 }
 
 //---------------------------------------------------------------------
 
 // public
 void kpView::addToQueuedArea (const QRegion &region)
 {
 #if DEBUG_KP_VIEW && 0
     qCDebug(kpLogViews) << "kpView(" << objectName ()
                << ")::addToQueuedArea() already=" << d->queuedUpdateArea
                << " - plus - " << region
                << endl;
 #endif
     d->queuedUpdateArea += region;
 }
 
 //---------------------------------------------------------------------
 
 // public
 void kpView::addToQueuedArea (const QRect &rect)
 {
 #if DEBUG_KP_VIEW && 0
     qCDebug(kpLogViews) << "kpView(" << objectName ()
                << ")::addToQueuedArea() already=" << d->queuedUpdateArea
                << " - plus - " << rect
                << endl;
 #endif
     d->queuedUpdateArea += rect;
 }
 
 //---------------------------------------------------------------------
 
 // public
 void kpView::invalidateQueuedArea ()
 {
 #if DEBUG_KP_VIEW && 0
     qCDebug(kpLogViews) << "kpView::invalidateQueuedArea()";
 #endif
 
     d->queuedUpdateArea = QRegion ();
 }
 
 //---------------------------------------------------------------------
 
 // public
 void kpView::updateQueuedArea ()
 {
     kpViewManager *vm = viewManager ();
 #if DEBUG_KP_VIEW && 0
     qCDebug(kpLogViews) << "kpView(" << objectName ()
                << ")::updateQueuedArea() vm=" << (bool) vm
                << " queueUpdates=" << (vm && vm->queueUpdates ())
                << " fastUpdates=" << (vm && vm->fastUpdates ())
                << " area=" << d->queuedUpdateArea
                << endl;
 #endif
 
     if (!vm) {
         return;
     }
 
     if (vm->queueUpdates ()) {
         return;
     }
 
     if (!d->queuedUpdateArea.isEmpty ()) {
         vm->updateView (this, d->queuedUpdateArea);
     }
 
     invalidateQueuedArea ();
 }
 
 //---------------------------------------------------------------------
 
 // public
 QPoint kpView::mouseViewPoint (const QPoint &returnViewPoint) const
 {
     if (returnViewPoint != KP_INVALID_POINT) {
         return returnViewPoint;
     }
 
     // TODO: I don't think this is right for the main view since that's
     //       inside the scrollview (which can scroll).
     return mapFromGlobal (QCursor::pos ());
 }
 
 //---------------------------------------------------------------------
 
 // public virtual
 QVariant kpView::inputMethodQuery (Qt::InputMethodQuery query) const
 {
 #if DEBUG_KP_VIEW && 1
     qCDebug(kpLogViews) << "kpView(" << objectName () << ")::inputMethodQuery()";
 #endif
     QVariant ret;
     switch (query)
     {
       case Qt::ImCursorRectangle:
       {
           QRect r = d->viewManager->textCursorRect ();
           r.setTopLeft (r.topLeft () + origin ());
           r.setHeight (r.height() + 2);
           r = transformDocToView (r);
           ret = r;
           break;
       }
       case Qt::ImFont:
       {
         if (textSelection ())
         {
             ret = textSelection ()->textStyle ().font ();
         }
         break;
       }
       default:
         break;
     }
     return ret;
 }
 
 //---------------------------------------------------------------------
 
 #include "moc_kpView.cpp"