From a87e0ede82e41b47ddb9ad7810a1266ec73d51ea Mon Sep 17 00:00:00 2001
From: neoraider <devnull@localhost>
Date: Wed, 16 Apr 2008 19:13:03 +0000
Subject: zoomedit: * Removed scrollbars, allowing endless movement now

---
 src/Gui/RenderArea.cpp | 82 ++++++--------------------------------------------
 src/Gui/RenderArea.h   | 11 +++----
 2 files changed, 13 insertions(+), 80 deletions(-)

(limited to 'src/Gui')

diff --git a/src/Gui/RenderArea.cpp b/src/Gui/RenderArea.cpp
index 8062b80..eb1f3eb 100644
--- a/src/Gui/RenderArea.cpp
+++ b/src/Gui/RenderArea.cpp
@@ -32,7 +32,7 @@ namespace Gui {
 GdkGLConfig *RenderArea::glconfig = 0;
 
 RenderArea::RenderArea(BaseObjectType *cobject, const Glib::RefPtr<Gnome::Glade::Xml> &xml)
-: Gtk::DrawingArea(cobject), view(0), xCenter(0), yCenter(0), zoomLevel(0), scale(100) {
+: Gtk::DrawingArea(cobject), view(0), xCenter(0), yCenter(0), viewWidth(0), viewHeight(0), zoomLevel(0), scale(100) {
   if(!glconfig) {
     glconfig = gdk_gl_config_new_by_mode((GdkGLConfigMode)(GDK_GL_MODE_RGB | GDK_GL_MODE_DOUBLE));
     if(!glconfig) glconfig = gdk_gl_config_new_by_mode(GDK_GL_MODE_RGB); // Hmm, can't find double buffered config
@@ -54,12 +54,6 @@ RenderArea::RenderArea(BaseObjectType *cobject, const Glib::RefPtr<Gnome::Glade:
   xml->get_widget("ToolButtonZoomOut", button);
   button->signal_clicked().connect(sigc::bind(sigc::mem_fun(this, &RenderArea::zoom), -2, 0.5f, 0.5f));
   
-  xml->get_widget("Hscrollbar", hScrollbar);
-  hScrollbar->signal_value_changed().connect(sigc::mem_fun(this, &RenderArea::updateScrolling));
-  
-  xml->get_widget("Vscrollbar", vScrollbar);
-  vScrollbar->signal_value_changed().connect(sigc::mem_fun(this, &RenderArea::updateScrolling));
-  
   gtk_widget_set_gl_capability(GTK_WIDGET(cobject), glconfig, 0, TRUE, GDK_GL_RGBA_TYPE);
 }
 
@@ -127,7 +121,7 @@ void RenderArea::zoom(int zoom, float x, float y) {
   zoomLevel = std::max(std::min(zoomLevel + zoom, 50), -100);
   scale = 100*std::pow(1.1f, zoomLevel);
   
-  updateScrollbars(x, y);
+  updateScrolling(x, y);
 }
 
 void RenderArea::updateViewport() {
@@ -144,75 +138,17 @@ void RenderArea::updateViewport() {
   
   gdkGLEnd();
   
-  updateScrollbars();
-}
-
-void RenderArea::updateScrollbars(float x, float y) {
-  float minX, maxX, minY, maxY;
-  const gdouble width = getViewWidth(), height = getViewHeight();
-  gdouble lower, upper, pageSize, value;
-  
-  if(!view)
-    return;
-  
-  view->getBounds(&minX, &maxX, &minY, &maxY);
-  float xVal = std::max(std::fabs(minX), std::fabs(maxX));
-  float yVal = std::max(std::fabs(minY), std::fabs(maxY));
-  
-  get_window()->freeze_updates();
-  
-  lower = hScrollbar->get_adjustment()->get_lower();
-  upper = hScrollbar->get_adjustment()->get_upper();
-  pageSize = hScrollbar->get_adjustment()->get_page_size();
-  
-  hScrollbar->get_adjustment()->set_lower(-xVal + width/2);
-  hScrollbar->get_adjustment()->set_upper(xVal + width/2);
-  hScrollbar->get_adjustment()->set_page_size(width);
-  
-  if(pageSize > (upper-lower) && width < 2*xVal)
-    value = 0;
-  else
-    value = hScrollbar->get_value() + (x-0.5)*(pageSize-width);
-  
-  hScrollbar->set_value(std::max(std::min(value, xVal - width/2), -xVal + width/2));
-  
-  lower = vScrollbar->get_adjustment()->get_lower();
-  upper = vScrollbar->get_adjustment()->get_upper();
-  pageSize = vScrollbar->get_adjustment()->get_page_size();
-  
-  vScrollbar->get_adjustment()->set_lower(-yVal + height/2);
-  vScrollbar->get_adjustment()->set_upper(yVal + height/2);
-  vScrollbar->get_adjustment()->set_page_size(height);
-  
-  if(pageSize > (upper-lower) && height < 2*yVal)
-    value = 0;
-  else
-    value = vScrollbar->get_value() + (y-0.5)*(pageSize-height);
-  
-  vScrollbar->set_value(std::max(std::min(value, yVal - height/2), -yVal + height/2));
-  
-  get_window()->thaw_updates();
-  
   updateScrolling();
 }
 
-void RenderArea::updateScrolling() {
-  const float imageWidth = hScrollbar->get_adjustment()->get_upper()-hScrollbar->get_adjustment()->get_lower();
-  const float imageHeight = vScrollbar->get_adjustment()->get_upper()-vScrollbar->get_adjustment()->get_lower();
-  
-  if(hScrollbar) {
-    if(imageWidth < getViewWidth())
-      xCenter = 0;
-    else
-      xCenter = hScrollbar->get_value();
-  }
+void RenderArea::updateScrolling(float x, float y) {
+  const float newWidth = get_width()/scale, newHeight = get_height()/scale;
   
-  if(vScrollbar) {
-    if(imageHeight < getViewHeight())
-      yCenter = 0;
-    else 
-      yCenter = vScrollbar->get_value();
-  }
+  xCenter += (x-0.5)*(viewWidth-newWidth);
+  yCenter += (y-0.5)*(viewHeight-newHeight);
+  
+  viewWidth = newWidth;
+  viewHeight = newHeight;
   
   queue_draw();
 }
diff --git a/src/Gui/RenderArea.h b/src/Gui/RenderArea.h
index 59498d4..8ac72d7 100644
--- a/src/Gui/RenderArea.h
+++ b/src/Gui/RenderArea.h
@@ -44,11 +44,11 @@ class RenderArea : public Gtk::DrawingArea {
     }
     
     float getViewWidth() const {
-      return get_width()/scale;
+      return viewWidth;
     }
     
     float getViewHeight() const {
-      return get_height()/scale;
+      return viewHeight;
     }
     
     float getScale() const {return scale;}
@@ -59,12 +59,10 @@ class RenderArea : public Gtk::DrawingArea {
   private:
     static GdkGLConfig *glconfig;
     
-    Gtk::HScrollbar *hScrollbar;
-    Gtk::VScrollbar *vScrollbar;
-    
     View::View *view;
     
     float xCenter, yCenter;
+    float viewWidth, viewHeight;
     
     int zoomLevel;
     float scale;
@@ -77,8 +75,7 @@ class RenderArea : public Gtk::DrawingArea {
     void zoom(int zoom, float x = 0.5f, float y = 0.5f);
     
     void updateViewport();
-    void updateScrollbars(float x = 0.5f, float y = 0.5f);
-    void updateScrolling();
+    void updateScrolling(float x = 0.5f, float y = 0.5f);
     
     bool gdkGLBegin() {
       GtkWidget *widget = GTK_WIDGET(gobj());
-- 
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