# HG changeset patch
# User Chris Cannam
# Date 1156177595 0
# Node ID a859b87162cad7ea40c3ca5d4796dc2593e9f3ea
# Parent  e981307646354b7cecdf780858e00e739d074ff6
* beginnings of drag up/down in layers as appropriate

diff -r e98130764635 -r a859b87162ca layer/SpectrogramLayer.cpp
--- a/layer/SpectrogramLayer.cpp	Mon Aug 21 13:18:50 2006 +0000
+++ b/layer/SpectrogramLayer.cpp	Mon Aug 21 16:26:35 2006 +0000
@@ -2787,10 +2787,12 @@
 
     int n = 0;
     defaultStep = 0;
+    bool haveDefault = false;
     float s2 = sqrtf(sqrtf(2));
     while (dist > min) {
-        if (max >= m_initialMaxFrequency) {
+        if (!haveDefault && max <= m_initialMaxFrequency) {
             defaultStep = n;
+            haveDefault = true;
         }
         ++n;
         dist /= s2;
diff -r e98130764635 -r a859b87162ca view/Pane.cpp
--- a/view/Pane.cpp	Mon Aug 21 13:18:50 2006 +0000
+++ b/view/Pane.cpp	Mon Aug 21 16:26:35 2006 +0000
@@ -652,6 +652,20 @@
 	m_navigating = true;
 	m_dragCentreFrame = m_centreFrame;
 
+        //!!! pull out into function to go with mouse move code
+
+        m_dragStartMinValue = 0;
+
+        Layer *layer = 0;
+        if (getLayerCount() > 0) layer = getLayer(getLayerCount() - 1);
+
+        if (layer) {
+            float min = 0.f, max = 0.f;
+            if (layer->getDisplayExtents(min, max)) {
+                m_dragStartMinValue = min;
+            }
+        }
+
     } else if (mode == ViewManager::SelectMode) {
 
 	bool closeToLeft = false, closeToRight = false;
@@ -926,6 +940,52 @@
 	    if (getXForFrame(m_centreFrame) != getXForFrame(newCentreFrame)) {
 		setCentreFrame(newCentreFrame);
 	    }
+
+            //!!! For drag up/down, we need to: call getValueExtents
+            //and getDisplayExtents and see whether both return true
+            //(we can only drag up/down if they do); and check whether
+            //the ranges returned differ (likewise).  Then, we know
+            //the height of the layer, so...
+
+            //!!! this should have its own function
+
+            Layer *layer = 0;
+            if (getLayerCount() > 0) layer = getLayer(getLayerCount() - 1);
+
+            if (layer) {
+
+                float vmin = 0.f, vmax = 0.f;
+                bool vlog = false;
+                QString vunit;
+
+                float dmin = 0.f, dmax = 0.f;
+
+                if (layer->getValueExtents(vmin, vmax, vlog, vunit) &&
+                    layer->getDisplayExtents(dmin, dmax) &&
+                    (dmin > vmin || dmax < vmax)) {
+
+                    int ydiff = e->y() - m_clickPos.y();
+                    std::cerr << "ydiff = " << ydiff << std::endl;
+
+                    float perpix = (dmax - dmin) / height();
+                    float valdiff = ydiff * perpix;
+                    std::cerr << "valdiff = " << valdiff << std::endl;
+
+                    float newmin = m_dragStartMinValue + valdiff;
+                    float newmax = m_dragStartMinValue + (dmax - dmin) + valdiff;
+                    if (newmin < vmin) {
+                        newmax += vmin - newmin;
+                        newmin += vmin - newmin;
+                    }
+                    if (newmax > vmax) {
+                        newmin -= newmax - vmax;
+                        newmax -= newmax - vmax;
+                    }
+                    std::cerr << "(" << dmin << ", " << dmax << ") -> ("
+                              << newmin << ", " << newmax << ") (drag start " << m_dragStartMinValue << ")" << std::endl;
+                    layer->setDisplayExtents(newmin, newmax);
+                }
+            }
 	}
 
     } else if (mode == ViewManager::SelectMode) {
diff -r e98130764635 -r a859b87162ca view/Pane.h
--- a/view/Pane.h	Mon Aug 21 13:18:50 2006 +0000
+++ b/view/Pane.h	Mon Aug 21 16:26:35 2006 +0000
@@ -93,6 +93,7 @@
     bool m_navigating;
     bool m_resizing;
     size_t m_dragCentreFrame;
+    float m_dragStartMinValue;
     bool m_centreLineVisible;
     size_t m_selectionStartFrame;
     Selection m_editingSelection;