Index: Source/core/page/PageScaleConstraints.cpp |
diff --git a/Source/core/page/PageScaleConstraints.cpp b/Source/core/page/PageScaleConstraints.cpp |
new file mode 100644 |
index 0000000000000000000000000000000000000000..9c82650432dbdec821f938d594e8d3fbc967db23 |
--- /dev/null |
+++ b/Source/core/page/PageScaleConstraints.cpp |
@@ -0,0 +1,101 @@ |
+/* |
+ * Copyright (C) 2013 Google Inc. All rights reserved. |
+ * |
+ * Redistribution and use in source and binary forms, with or without |
+ * modification, are permitted provided that the following conditions are |
+ * met: |
+ * |
+ * * Redistributions of source code must retain the above copyright |
+ * notice, this list of conditions and the following disclaimer. |
+ * * Redistributions in binary form must reproduce the above |
+ * copyright notice, this list of conditions and the following disclaimer |
+ * in the documentation and/or other materials provided with the |
+ * distribution. |
+ * * Neither the name of Google Inc. nor the names of its |
+ * contributors may be used to endorse or promote products derived from |
+ * this software without specific prior written permission. |
+ * |
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS |
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT |
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR |
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT |
+ * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, |
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT |
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE |
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
+ */ |
+ |
+#include "config.h" |
+#include "PageScaleConstraints.h" |
+ |
+namespace WebCore { |
+ |
+PageScaleConstraints::PageScaleConstraints() |
+ : initialScale(-1), minimumScale(-1), maximumScale(-1) { } |
+ |
+PageScaleConstraints::PageScaleConstraints(float initial, float minimum, float maximum) |
+ : initialScale(initial), minimumScale(minimum), maximumScale(maximum) { } |
+ |
+void PageScaleConstraints::overrideWith(const PageScaleConstraints& other) |
+{ |
+ if (other.initialScale != -1) { |
+ initialScale = other.initialScale; |
+ if (minimumScale != -1) |
+ minimumScale = std::min(minimumScale, other.initialScale); |
+ } |
+ if (other.minimumScale != -1) |
+ minimumScale = other.minimumScale; |
+ if (other.maximumScale != -1) |
+ maximumScale = other.maximumScale; |
+ if (!other.layoutSize.isEmpty()) |
+ layoutSize = other.layoutSize; |
+ clampAll(); |
+} |
+ |
+float PageScaleConstraints::clampToConstraints(float pageScaleFactor) const |
+{ |
+ if (pageScaleFactor == -1) |
+ return pageScaleFactor; |
+ if (minimumScale != -1) |
+ pageScaleFactor = std::max(pageScaleFactor, minimumScale); |
+ if (maximumScale != -1) |
+ pageScaleFactor = std::min(pageScaleFactor, maximumScale); |
+ return pageScaleFactor; |
+} |
+ |
+void PageScaleConstraints::clampAll() |
+{ |
+ if (minimumScale != -1 && maximumScale != -1) |
+ maximumScale = std::max(minimumScale, maximumScale); |
+ initialScale = clampToConstraints(initialScale); |
+} |
+ |
+void PageScaleConstraints::fitToContentsWidth(float contentsWidth, int viewWidthNotIncludingScrollbars) |
+{ |
+ if (!contentsWidth || !viewWidthNotIncludingScrollbars) |
+ return; |
+ |
+ // Clamp the minimum scale so that the viewport can't exceed the document |
+ // width. |
+ minimumScale = std::max(minimumScale, viewWidthNotIncludingScrollbars / contentsWidth); |
+ |
+ // If the initial scale wasn't defined, set it to minimum scale now that we |
+ // know the real value. |
+ if (initialScale == -1) |
+ initialScale = minimumScale; |
+ |
+ clampAll(); |
+} |
+ |
+bool PageScaleConstraints::operator==(const PageScaleConstraints& other) const |
+{ |
+ return layoutSize == other.layoutSize |
+ && initialScale == other.initialScale |
+ && minimumScale == other.minimumScale |
+ && maximumScale == other.maximumScale; |
+} |
+ |
+} // namespace WebCore |