Initial revision

git-svn-id: svn://svn.code.sf.net/p/tigervnc/code/trunk@2 3789f03b-4d11-0410-bbf8-ca57d06f2519

1 files changed, 157 insertions, 0 deletions

diff --git a/tx/TXViewport.cxx b/tx/TXViewport.cxx
new file mode 100644
index 00000000..67982e9f
--- /dev/null
+++ b/tx/TXViewport.cxx
@@ -0,0 +1,157 @@
+/* Copyright (C) 2002-2003 RealVNC Ltd.  All Rights Reserved.
+ *    
+ * This is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ * 
+ * This software is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ * 
+ * You should have received a copy of the GNU General Public License
+ * along with this software; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307,
+ * USA.
+ */
+//
+// TXViewport.cxx
+//
+
+#include "TXViewport.h"
+#include <stdio.h>
+
+TXViewport::TXViewport(Display* dpy_, int w, int h, TXWindow* parent_)
+  : TXWindow(dpy_, w, h, parent_), child(0), hScrollbar(0),
+    vScrollbar(0), scrollbarSize(15), xOff(0), yOff(0), bumpScrollTimer(this),
+    bumpScroll(false), needScrollbars(false), bumpScrollX(0), bumpScrollY(0)
+{
+  clipper = new TXWindow(dpy, width()-scrollbarSize, height()-scrollbarSize,
+                         this);
+  clipper->setBg(black);
+  hScrollbar = new TXScrollbar(dpy, width()-scrollbarSize, scrollbarSize,
+                               false, this, this);
+  vScrollbar = new TXScrollbar(dpy, scrollbarSize, height()-scrollbarSize,
+                               true, this, this);
+}
+
+TXViewport::~TXViewport()
+{
+  delete clipper;
+  delete hScrollbar;
+  delete vScrollbar;
+}
+
+void TXViewport::setChild(TXWindow* child_)
+{
+  child = child_;
+  XReparentWindow(dpy, child->win(), clipper->win(), 0, 0);
+  xOff = yOff = 0;
+  child->map();
+  resizeNotify();
+}
+
+bool TXViewport::setOffset(int x, int y)
+{
+  if (clipper->width() >= child->width()) {
+    x = (clipper->width() - child->width()) / 2;
+  } else {
+    if (x > 0) x = 0;
+    if (x + child->width() < clipper->width())
+      x = clipper->width() - child->width();
+  }
+
+  if (clipper->height() >= child->height()) {
+    y = (clipper->height() - child->height()) / 2;
+  } else {
+    if (y > 0) y = 0;
+    if (y + child->height() < clipper->height())
+      y = clipper->height() - child->height();
+  }
+
+  if (x != xOff || y != yOff) {
+    xOff = x;
+    yOff = y;
+    child->move(xOff, yOff);
+    return true;
+  }
+
+  return false;
+}
+
+void TXViewport::setBumpScroll(bool b)
+{
+  bumpScroll = b;
+  resizeNotify();
+}
+
+// Note: bumpScrollEvent() only works if the viewport is positioned at 0,0 and
+// is the same width and height as the screen.
+bool TXViewport::bumpScrollEvent(XMotionEvent* ev)
+{
+  if (!bumpScroll) return false;
+  int bumpScrollPixels = 20;
+  bumpScrollX = bumpScrollY = 0;
+
+  if (ev->x_root == width()-1)  bumpScrollX = -bumpScrollPixels;
+  else if (ev->x_root == 0)     bumpScrollX = bumpScrollPixels;
+  if (ev->y_root == height()-1) bumpScrollY = -bumpScrollPixels;
+  else if (ev->y_root == 0)     bumpScrollY = bumpScrollPixels;
+
+  if (bumpScrollX || bumpScrollY) {
+    if (bumpScrollTimer.isSet()) return true;
+    if (setOffset(xOff + bumpScrollX, yOff + bumpScrollY)) {
+      bumpScrollTimer.reset(25);
+      return true;
+    }
+  }
+
+  bumpScrollTimer.cancel();
+  return false;
+}
+
+void TXViewport::timerCallback(Timer* timer)
+{
+  if (setOffset(xOff + bumpScrollX, yOff + bumpScrollY))
+    bumpScrollTimer.reset(25);
+}
+
+void TXViewport::resizeNotify()
+{
+  needScrollbars = (!bumpScroll &&
+                    (width() < child->width() || height() < child->height()) &&
+                    (width() > scrollbarSize && height() > scrollbarSize));
+  if (needScrollbars) {
+    clipper->resize(width()-scrollbarSize, height()-scrollbarSize);
+    hScrollbar->map();
+    vScrollbar->map();
+  } else {
+    clipper->resize(width(), height());
+    hScrollbar->unmap();
+    vScrollbar->unmap();
+  }
+
+  setOffset(xOff, yOff);
+
+  if (needScrollbars) {
+    hScrollbar->move(0, height()-scrollbarSize);
+    hScrollbar->resize(width()-scrollbarSize, scrollbarSize);
+    hScrollbar->set(child->width(), -xOff, width()-scrollbarSize);
+    vScrollbar->move(width()-scrollbarSize, 0);
+    vScrollbar->resize(scrollbarSize, height()-scrollbarSize);
+    vScrollbar->set(child->height(), -yOff, height()-scrollbarSize);
+  }
+}
+
+void TXViewport::scrollbarPos(int x, int y, TXScrollbar* sb)
+{
+  if (sb == hScrollbar) {
+    x = -x;
+    y = yOff;
+  } else {
+    x = xOff;
+    y = -y;
+  }
+  setOffset(x, y);
+}