X-Git-Url: http://source.jalview.org/gitweb/?a=blobdiff_plain;f=src%2Fjalview%2Fviewmodel%2FViewportRanges.java;h=9a1e13c4d6ead8cd4ea5c95dd4a375ebe3774e6b;hb=6716ff86e500acc2800936b3f3c7132927a9246b;hp=18703b4724ffe6e523be817d2532596760e4836d;hpb=2feac6dabe64b144783f8538fab352e987eadcb6;p=jalview.git

diff --git a/src/jalview/viewmodel/ViewportRanges.java b/src/jalview/viewmodel/ViewportRanges.java
index 18703b4..9a1e13c 100644
--- a/src/jalview/viewmodel/ViewportRanges.java
+++ b/src/jalview/viewmodel/ViewportRanges.java
@@ -21,16 +21,30 @@
 package jalview.viewmodel;
 
 import jalview.datamodel.AlignmentI;
+import jalview.datamodel.HiddenColumns;
 
 /**
- * Embryonic class which: Supplies and updates viewport properties relating to
- * position such as: start and end residues and sequences; ideally will serve
- * hidden columns/rows too. Intention also to support calculations for
- * positioning, scrolling etc. such as finding the middle of the viewport,
- * checking for scrolls off screen
+ * Supplies and updates viewport properties relating to position such as: start
+ * and end residues and sequences; ideally will serve hidden columns/rows too.
+ * Intention also to support calculations for positioning, scrolling etc. such
+ * as finding the middle of the viewport, checking for scrolls off screen
  */
 public class ViewportRanges extends ViewportProperties
 {
+  public static final String STARTRES = "startres";
+
+  public static final String ENDRES = "endres";
+
+  public static final String STARTSEQ = "startseq";
+
+  public static final String ENDSEQ = "endseq";
+
+  public static final String STARTRESANDSEQ = "startresandseq";
+
+  public static final String MOVE_VIEWPORT = "move_viewport";
+
+  private boolean wrappedMode = false;
+
   // start residue of viewport
   private int startRes;
 
@@ -83,8 +97,7 @@ public class ViewportRanges extends ViewportProperties
    */
   public int getVisibleAlignmentWidth()
   {
-    // TODO need access to hidden columns here
-    return al.getWidth(); // - hidden columns
+    return al.getWidth() - al.getHiddenColumns().getSize();
   }
 
   /**
@@ -96,79 +109,216 @@ public class ViewportRanges extends ViewportProperties
   }
 
   /**
-   * Set first residue visible in the viewport
+   * Set first residue visible in the viewport, and retain the current width.
+   * Fires a property change event.
    * 
    * @param res
    *          residue position
    */
   public void setStartRes(int res)
   {
-    if (res > al.getWidth() - 1)
-    {
-      res = al.getWidth() - 1;
-    }
-    else if (res < 0)
+    int width = getViewportWidth();
+    setStartEndRes(res, res + width - 1);
+  }
+
+  /**
+   * Set start and end residues at the same time. This method only fires one
+   * event for the two changes, and should be used in preference to separate
+   * calls to setStartRes and setEndRes.
+   * 
+   * @param start
+   *          the start residue
+   * @param end
+   *          the end residue
+   */
+  public void setStartEndRes(int start, int end)
+  {
+    int[] oldvalues = updateStartEndRes(start, end);
+    int oldstartres = oldvalues[0];
+    int oldendres = oldvalues[1];
+
+    changeSupport.firePropertyChange(STARTRES, oldstartres, startRes);
+    if (oldstartres == startRes)
     {
-      res = 0;
+      // event won't be fired if start positions are same
+      // fire an event for the end positions in case they changed
+      changeSupport.firePropertyChange(ENDRES, oldendres, endRes);
     }
-    this.startRes = res;
   }
 
   /**
-   * Set last residue visible in the viewport
+   * Update start and end residue values, adjusting for width constraints if
+   * necessary
    * 
-   * @param res
-   *          residue position
+   * @param start
+   *          start residue
+   * @param end
+   *          end residue
+   * @return array containing old start and end residue values
    */
-  public void setEndRes(int res)
+  private int[] updateStartEndRes(int start, int end)
   {
-    if (res >= al.getWidth())
+    int oldstartres = this.startRes;
+
+    /*
+     * if not wrapped, don't leave white space at the right margin
+     */
+    int lastColumn = getVisibleAlignmentWidth() - 1;
+    if (!wrappedMode && (start > lastColumn))
+    {
+      startRes = Math.max(lastColumn, 0);
+    }
+    else if (start < 0)
+    {
+      startRes = 0;
+    }
+    else
+    {
+      startRes = start;
+    }
+
+    int oldendres = this.endRes;
+    if (end < 0)
+    {
+      endRes = 0;
+    }
+    else if (!wrappedMode && (end > lastColumn))
     {
-      res = al.getWidth() - 1;
+      endRes = Math.max(lastColumn, 0);
     }
-    else if (res < 0)
+    else
     {
-      res = 0;
+      endRes = end;
     }
-    this.endRes = res;
+    return new int[] { oldstartres, oldendres };
   }
 
   /**
-   * Set the first sequence visible in the viewport
+   * Set the first sequence visible in the viewport, maintaining the height. If
+   * the viewport would extend past the last sequence, sets the viewport so it
+   * sits at the bottom of the alignment. Fires a property change event.
    * 
    * @param seq
    *          sequence position
    */
   public void setStartSeq(int seq)
   {
-    if (seq > al.getHeight() - 1)
+    int startseq = seq;
+    int height = getViewportHeight();
+    if (startseq + height - 1 > getVisibleAlignmentHeight() - 1)
     {
-      seq = al.getHeight() - 1;
+      startseq = getVisibleAlignmentHeight() - height;
     }
-    else if (seq < 0)
+    setStartEndSeq(startseq, startseq + height - 1);
+  }
+
+  /**
+   * Set start and end sequences at the same time. The viewport height may
+   * change. This method only fires one event for the two changes, and should be
+   * used in preference to separate calls to setStartSeq and setEndSeq.
+   * 
+   * @param start
+   *          the start sequence
+   * @param end
+   *          the end sequence
+   */
+  public void setStartEndSeq(int start, int end)
+  {
+    int[] oldvalues = updateStartEndSeq(start, end);
+    int oldstartseq = oldvalues[0];
+    int oldendseq = oldvalues[1];
+
+    changeSupport.firePropertyChange(STARTSEQ, oldstartseq, startSeq);
+    if (oldstartseq == startSeq)
+    {
+      // event won't be fired if start positions are the same
+      // fire in case the end positions changed
+      changeSupport.firePropertyChange(ENDSEQ, oldendseq, endSeq);
+    }
+  }
+
+  /**
+   * Update start and end sequence values, adjusting for height constraints if
+   * necessary
+   * 
+   * @param start
+   *          start sequence
+   * @param end
+   *          end sequence
+   * @return array containing old start and end sequence values
+   */
+  private int[] updateStartEndSeq(int start, int end)
+  {
+    int oldstartseq = this.startSeq;
+    int visibleHeight = getVisibleAlignmentHeight();
+    if (start > visibleHeight - 1)
+    {
+      startSeq = Math.max(visibleHeight - 1, 0);
+    }
+    else if (start < 0)
+    {
+      startSeq = 0;
+    }
+    else
+    {
+      startSeq = start;
+    }
+
+    int oldendseq = this.endSeq;
+    if (end >= visibleHeight)
+    {
+      endSeq = Math.max(visibleHeight - 1, 0);
+    }
+    else if (end < 0)
     {
-      seq = 0;
+      endSeq = 0;
     }
-    this.startSeq = seq;
+    else
+    {
+      endSeq = end;
+    }
+    return new int[] { oldstartseq, oldendseq };
   }
 
   /**
-   * Set the last sequence visible in the viewport
+   * Set the last sequence visible in the viewport. Fires a property change
+   * event.
    * 
    * @param seq
    *          sequence position
    */
   public void setEndSeq(int seq)
   {
-    if (seq >= al.getHeight())
-    {
-      seq = al.getHeight() - 1;
-    }
-    else if (seq < 0)
+    int height = getViewportHeight();
+    setStartEndSeq(seq - height + 1, seq);
+  }
+
+  /**
+   * Set start residue and start sequence together (fires single event). The
+   * event supplies a pair of old values and a pair of new values: [old start
+   * residue, old start sequence] and [new start residue, new start sequence]
+   * 
+   * @param res
+   *          the start residue
+   * @param seq
+   *          the start sequence
+   */
+  public void setStartResAndSeq(int res, int seq)
+  {
+    int width = getViewportWidth();
+    int[] oldresvalues = updateStartEndRes(res, res + width - 1);
+
+    int startseq = seq;
+    int height = getViewportHeight();
+    if (startseq + height - 1 > getVisibleAlignmentHeight() - 1)
     {
-      seq = 0;
+      startseq = getVisibleAlignmentHeight() - height;
     }
-    this.endSeq = seq;
+    int[] oldseqvalues = updateStartEndSeq(startseq, startseq + height - 1);
+
+    int[] old = new int[] { oldresvalues[0], oldseqvalues[0] };
+    int[] newresseq = new int[] { startRes, startSeq };
+    changeSupport.firePropertyChange(STARTRESANDSEQ, old, newresseq);
   }
 
   /**
@@ -202,4 +352,410 @@ public class ViewportRanges extends ViewportProperties
   {
     return endSeq;
   }
+
+  /**
+   * Set viewport width in residues, without changing startRes. Use in
+   * preference to calculating endRes from the width, to avoid out by one
+   * errors! Fires a property change event.
+   * 
+   * @param w
+   *          width in residues
+   */
+  public void setViewportWidth(int w)
+  {
+    setStartEndRes(startRes, startRes + w - 1);
+  }
+
+  /**
+   * Set viewport height in residues, without changing startSeq. Use in
+   * preference to calculating endSeq from the height, to avoid out by one
+   * errors! Fires a property change event.
+   * 
+   * @param h
+   *          height in sequences
+   */
+  public void setViewportHeight(int h)
+  {
+    setStartEndSeq(startSeq, startSeq + h - 1);
+  }
+
+  /**
+   * Set viewport horizontal start position and width. Use in preference to
+   * calculating endRes from the width, to avoid out by one errors! Fires a
+   * property change event.
+   * 
+   * @param start
+   *          start residue
+   * @param w
+   *          width in residues
+   */
+  public void setViewportStartAndWidth(int start, int w)
+  {
+    int vpstart = start;
+    if (vpstart < 0)
+    {
+      vpstart = 0;
+    }
+
+    /*
+     * if not wrapped, don't leave white space at the right margin
+     */
+    if (!wrappedMode)
+    {
+      if ((w <= getVisibleAlignmentWidth())
+              && (vpstart + w - 1 > getVisibleAlignmentWidth() - 1))
+      {
+        vpstart = getVisibleAlignmentWidth() - w;
+      }
+
+    }
+    setStartEndRes(vpstart, vpstart + w - 1);
+  }
+
+  /**
+   * Set viewport vertical start position and height. Use in preference to
+   * calculating endSeq from the height, to avoid out by one errors! Fires a
+   * property change event.
+   * 
+   * @param start
+   *          start sequence
+   * @param h
+   *          height in sequences
+   */
+  public void setViewportStartAndHeight(int start, int h)
+  {
+    int vpstart = start;
+    if (vpstart < 0)
+    {
+      vpstart = 0;
+    }
+    else if ((h <= getVisibleAlignmentHeight())
+            && (vpstart + h - 1 > getVisibleAlignmentHeight() - 1))
+    // viewport height is less than the full alignment and we are running off
+    // the bottom
+    {
+      vpstart = getVisibleAlignmentHeight() - h;
+    }
+    setStartEndSeq(vpstart, vpstart + h - 1);
+  }
+
+  /**
+   * Get width of viewport in residues
+   * 
+   * @return width of viewport
+   */
+  public int getViewportWidth()
+  {
+    return (endRes - startRes + 1);
+  }
+
+  /**
+   * Get height of viewport in residues
+   * 
+   * @return height of viewport
+   */
+  public int getViewportHeight()
+  {
+    return (endSeq - startSeq + 1);
+  }
+
+  /**
+   * Scroll the viewport range vertically. Fires a property change event.
+   * 
+   * @param up
+   *          true if scrolling up, false if down
+   * 
+   * @return true if the scroll is valid
+   */
+  public boolean scrollUp(boolean up)
+  {
+    /*
+     * if in unwrapped mode, scroll up or down one sequence row;
+     * if in wrapped mode, scroll by one visible width of columns
+     */
+    if (up)
+    {
+      if (wrappedMode)
+      {
+        pageUp();
+      }
+      else
+      {
+        if (startSeq < 1)
+        {
+          return false;
+        }
+        setStartSeq(startSeq - 1);
+      }
+    }
+    else
+    {
+      if (wrappedMode)
+      {
+        pageDown();
+      }
+      else
+      {
+        if (endSeq >= getVisibleAlignmentHeight() - 1)
+        {
+          return false;
+        }
+        setStartSeq(startSeq + 1);
+      }
+    }
+    return true;
+  }
+
+  /**
+   * Scroll the viewport range horizontally. Fires a property change event.
+   * 
+   * @param right
+   *          true if scrolling right, false if left
+   * 
+   * @return true if the scroll is valid
+   */
+  public boolean scrollRight(boolean right)
+  {
+    if (!right)
+    {
+      if (startRes < 1)
+      {
+        return false;
+      }
+
+      setStartRes(startRes - 1);
+    }
+    else
+    {
+      if (endRes >= getVisibleAlignmentWidth() - 1)
+      {
+        return false;
+      }
+
+      setStartRes(startRes + 1);
+    }
+
+    return true;
+  }
+
+  /**
+   * Scroll a wrapped alignment so that the specified residue is in the first
+   * repeat of the wrapped view. Fires a property change event. Answers true if
+   * the startRes changed, else false.
+   * 
+   * @param res
+   *          residue position to scroll to
+   * @return
+   */
+  public boolean scrollToWrappedVisible(int res)
+  {
+    int oldStartRes = startRes;
+    int width = getViewportWidth();
+
+    if (res >= oldStartRes && res < oldStartRes + width)
+    {
+      return false;
+    }
+
+    boolean up = res < oldStartRes;
+    int widthsToScroll = Math.abs((res - oldStartRes) / width);
+    if (up)
+    {
+      widthsToScroll++;
+    }
+
+    int residuesToScroll = width * widthsToScroll;
+    int newStartRes = up ? oldStartRes - residuesToScroll : oldStartRes
+            + residuesToScroll;
+    if (newStartRes < 0)
+    {
+      newStartRes = 0;
+    }
+
+    setStartRes(newStartRes);
+
+    return true;
+  }
+
+  /**
+   * Scroll so that (x,y) is visible. Fires a property change event.
+   * 
+   * @param x
+   *          x position in alignment
+   * @param y
+   *          y position in alignment
+   */
+  public void scrollToVisible(int x, int y)
+  {
+    while (y < startSeq)
+    {
+      scrollUp(true);
+    }
+    while (y > endSeq)
+    {
+      scrollUp(false);
+    }
+    
+    HiddenColumns hidden = al.getHiddenColumns();
+    while (x < hidden.adjustForHiddenColumns(startRes))
+    {
+      if (!scrollRight(false))
+      {
+        break;
+      }
+    }
+    while (x > hidden.adjustForHiddenColumns(endRes))
+    {
+      if (!scrollRight(true))
+      {
+        break;
+      }
+    }
+  }
+
+  /**
+   * Set the viewport location so that a position is visible
+   * 
+   * @param x
+   *          column to be visible
+   * @param y
+   *          row to be visible
+   */
+  public boolean setViewportLocation(int x, int y)
+  {
+    // if (x,y) is already visible don't do anything
+    boolean changedLocation = false;
+    if (startRes > x || x > endRes || startSeq > y && y > endSeq)
+    {
+      int width = getViewportWidth();
+      int[] oldresvalues = updateStartEndRes(x, x + width - 1);
+
+      int startseq = y;
+      int height = getViewportHeight();
+      if (startseq + height - 1 > getVisibleAlignmentHeight() - 1)
+      {
+        startseq = getVisibleAlignmentHeight() - height;
+      }
+      int[] oldseqvalues = updateStartEndSeq(startseq,
+              startseq + height - 1);
+
+      int[] old = new int[] { oldresvalues[0], oldseqvalues[0] };
+      int[] newresseq = new int[] { startRes, startSeq };
+      changedLocation = true;
+      changeSupport.firePropertyChange(MOVE_VIEWPORT, old, newresseq);
+    }
+    return changedLocation;
+  }
+
+  /**
+   * Adjust sequence position for page up. Fires a property change event.
+   */
+  public void pageUp()
+  {
+    if (wrappedMode)
+    {
+      setStartRes(Math.max(0, getStartRes() - getViewportWidth()));
+    }
+    else
+    {
+      setViewportStartAndHeight(startSeq - (endSeq - startSeq),
+              getViewportHeight());
+    }
+  }
+
+  /**
+   * Adjust sequence position for page down. Fires a property change event.
+   */
+  public void pageDown()
+  {
+    if (wrappedMode)
+    {
+      /*
+       * if height is more than width (i.e. not all sequences fit on screen),
+       * increase page down to height
+       */
+      int newStart = getStartRes()
+              + Math.max(getViewportHeight(), getViewportWidth());
+
+      /*
+       * don't page down beyond end of alignment, or if not all
+       * sequences fit in the visible height
+       */
+      if (newStart < getVisibleAlignmentWidth())
+      {
+        setStartRes(newStart);
+      }
+    }
+    else
+    {
+      setViewportStartAndHeight(endSeq, getViewportHeight());
+    }
+  }
+
+  public void setWrappedMode(boolean wrapped)
+  {
+    wrappedMode = wrapped;
+  }
+
+  public boolean isWrappedMode()
+  {
+    return wrappedMode;
+  }
+
+  /**
+   * Answers the vertical scroll position (0..) to set, given the visible column
+   * that is at top left.
+   * 
+   * <pre>
+   * Example:
+   *    viewport width 40 columns (0-39, 40-79, 80-119...)
+   *    column 0 returns scroll position 0
+   *    columns 1-40 return scroll position 1
+   *    columns 41-80 return scroll position 2
+   *    etc
+   * </pre>
+   * 
+   * @param topLeftColumn
+   *          (0..)
+   * @return
+   */
+  public int getWrappedScrollPosition(final int topLeftColumn)
+  {
+    int w = getViewportWidth();
+
+    /*
+     * visible whole widths
+     */
+    int scroll = topLeftColumn / w;
+
+    /*
+     * add 1 for a part width if there is one
+     */
+    scroll += topLeftColumn % w > 0 ? 1 : 0;
+
+    return scroll;
+  }
+
+  /**
+   * Answers the maximum wrapped vertical scroll value, given the column
+   * position (0..) to show at top left of the visible region.
+   * 
+   * @param topLeftColumn
+   * @return
+   */
+  public int getWrappedMaxScroll(int topLeftColumn)
+  {
+    int scrollPosition = getWrappedScrollPosition(topLeftColumn);
+
+    /*
+     * how many more widths could be drawn after this one?
+     */
+    int columnsRemaining = getVisibleAlignmentWidth() - topLeftColumn;
+    int width = getViewportWidth();
+    int widthsRemaining = columnsRemaining / width
+            + (columnsRemaining % width > 0 ? 1 : 0) - 1;
+    int maxScroll = scrollPosition + widthsRemaining;
+
+    return maxScroll;
+  }
 }