*/
package jalview.viewmodel;
+import jalview.api.AlignViewportI;
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,
+ * Slightly less 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
*/
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)
+ 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 oldstartres = this.startRes;
+ if (start > al.getWidth() - 1)
+ {
+ startRes = al.getWidth() - 1;
+ }
+ else if (start < 0)
+ {
+ startRes = 0;
+ }
+ else
{
- res = al.getWidth() - 1;
+ startRes = start;
}
- else if (res < 0)
+
+ int oldendres = this.endRes;
+ if (end < 0)
{
- res = 0;
+ endRes = 0;
+ }
+ else
+ {
+ endRes = end;
+ }
+
+ changeSupport.firePropertyChange("startres", oldstartres, startRes);
+ if (oldstartres == startRes)
+ {
+ // 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
+ * Set last residue visible in the viewport. Fires a property change event.
*
* @param res
* residue position
*/
public void setEndRes(int res)
{
- if (res >= al.getWidth())
- {
- res = al.getWidth() - 1;
- }
- else if (res < 0)
+ int startres = res;
+ int width = getViewportWidth();
+ if (startres + width - 1 > al.getWidth() - 1)
{
- res = 0;
+ startres = al.getWidth() - width;
}
- this.endRes = res;
+ setStartEndRes(startres - width + 1, startres);
}
/**
- * 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 > al.getHeight() - 1)
+ {
+ startseq = al.getHeight() - height;
+ }
+ 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 oldstartseq = this.startSeq;
+ if (start > al.getHeight() - 1)
+ {
+ startSeq = al.getHeight() - 1;
+ }
+ else if (start < 0)
+ {
+ startSeq = 0;
+ }
+ else
+ {
+ startSeq = start;
+ }
+
+ int oldendseq = this.endSeq;
+ if (end >= al.getHeight())
+ {
+ endSeq = al.getHeight() - 1;
+ }
+ else if (end < 0)
+ {
+ endSeq = 0;
+ }
+ else
{
- seq = al.getHeight() - 1;
+ endSeq = end;
}
- else if (seq < 0)
+
+ changeSupport.firePropertyChange("startseq", oldstartseq, startSeq);
+ if (oldstartseq == startSeq)
{
- seq = 0;
+ // event won't be fired if start positions are the same
+ // fire in case the end positions changed
+ changeSupport.firePropertyChange("endseq", oldendseq, endSeq);
}
- this.startSeq = seq;
}
/**
- * 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)
- {
- seq = 0;
- }
- this.endSeq = seq;
+ int height = getViewportHeight();
+ setStartEndSeq(seq - height + 1, seq);
}
/**
{
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;
+ }
+ else if (vpstart + w - 1 > al.getWidth() - 1)
+ {
+ vpstart = al.getWidth() - 1;
+ }
+ 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 (vpstart + h - 1 > al.getHeight() - 1)
+ {
+ vpstart = al.getHeight() - 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 (up)
+ {
+ if (startSeq < 1)
+ {
+ return false;
+ }
+
+ setStartSeq(startSeq - 1);
+ }
+ else
+ {
+ if (endSeq >= al.getHeight() - 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 > al.getWidth() - 1)
+ {
+ return false;
+ }
+
+ setStartRes(startRes + 1);
+ }
+
+ return true;
+ }
+
+ /**
+ * Scroll a wrapped alignment so that the specified residue is visible. Fires
+ * a property change event.
+ *
+ * @param res
+ * residue position to scroll to
+ */
+ public void scrollToWrappedVisible(int res)
+ {
+ // get the start residue of the wrapped row which res is in
+ // and set that as our start residue
+ int width = getViewportWidth();
+ setStartRes((res / width) * width);
+ }
+
+ /**
+ * Scroll so that (x,y) is visible. Fires a property change event.
+ *
+ * @param x
+ * x position in alignment
+ * @param y
+ * y position in alignment
+ * @param av
+ * viewport to be visible in. Here until hidden columns JAL-2388
+ * merged, then use alignment to get hidden cols
+ */
+ public void scrollToVisible(int x, int y, AlignViewportI av)
+ {
+ 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;
+ }
+ }
+ }
+
+ /**
+ * Adjust sequence position for page up. Fires a property change event.
+ */
+ public void pageUp()
+ {
+ setViewportStartAndHeight(2 * startSeq - endSeq, getViewportHeight());
+ }
+
+ /**
+ * Adjust sequence position for page down. Fires a property change event.
+ */
+ public void pageDown()
+ {
+ setViewportStartAndHeight(endSeq, getViewportHeight());
+ }
}