| /* |
| * 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. |
| */ |
| |
| #ifndef GridArea_h |
| #define GridArea_h |
| |
| #include <algorithm> |
| #include "core/style/GridPositionsResolver.h" |
| #include "platform/wtf/Allocator.h" |
| #include "platform/wtf/HashMap.h" |
| #include "platform/wtf/MathExtras.h" |
| #include "platform/wtf/text/WTFString.h" |
| |
| namespace blink { |
| |
| // Recommended maximum size for both explicit and implicit grids. Note that this |
| // actually allows a [-9999,9999] range. The limit is low on purpouse because |
| // higher values easly trigger OOM situations. That will definitely improve once |
| // we switch from a vector of vectors based grid representation to a more |
| // efficient one memory-wise. |
| const int kGridMaxTracks = 1000; |
| |
| // A span in a single direction (either rows or columns). Note that |start_line| |
| // and |end_line| are grid lines' indexes. |
| // Despite line numbers in the spec start in "1", the indexes here start in "0". |
| struct GridSpan { |
| USING_FAST_MALLOC(GridSpan); |
| |
| public: |
| static GridSpan UntranslatedDefiniteGridSpan(int start_line, int end_line) { |
| return GridSpan(start_line, end_line, kUntranslatedDefinite); |
| } |
| |
| static GridSpan TranslatedDefiniteGridSpan(size_t start_line, |
| size_t end_line) { |
| return GridSpan(start_line, end_line, kTranslatedDefinite); |
| } |
| |
| static GridSpan IndefiniteGridSpan() { return GridSpan(0, 1, kIndefinite); } |
| |
| bool operator==(const GridSpan& o) const { |
| return type_ == o.type_ && start_line_ == o.start_line_ && |
| end_line_ == o.end_line_; |
| } |
| |
| size_t IntegerSpan() const { |
| DCHECK(IsTranslatedDefinite()); |
| DCHECK_GT(end_line_, start_line_); |
| return end_line_ - start_line_; |
| } |
| |
| int UntranslatedStartLine() const { |
| DCHECK_EQ(type_, kUntranslatedDefinite); |
| return start_line_; |
| } |
| |
| int UntranslatedEndLine() const { |
| DCHECK_EQ(type_, kUntranslatedDefinite); |
| return end_line_; |
| } |
| |
| size_t StartLine() const { |
| DCHECK(IsTranslatedDefinite()); |
| DCHECK_GE(start_line_, 0); |
| return start_line_; |
| } |
| |
| size_t EndLine() const { |
| DCHECK(IsTranslatedDefinite()); |
| DCHECK_GT(end_line_, 0); |
| return end_line_; |
| } |
| |
| struct GridSpanIterator { |
| GridSpanIterator(size_t v) : value(v) {} |
| |
| size_t operator*() const { return value; } |
| size_t operator++() { return value++; } |
| bool operator!=(GridSpanIterator other) const { |
| return value != other.value; |
| } |
| |
| size_t value; |
| }; |
| |
| GridSpanIterator begin() const { |
| DCHECK(IsTranslatedDefinite()); |
| return start_line_; |
| } |
| |
| GridSpanIterator end() const { |
| DCHECK(IsTranslatedDefinite()); |
| return end_line_; |
| } |
| |
| bool IsTranslatedDefinite() const { return type_ == kTranslatedDefinite; } |
| |
| bool IsIndefinite() const { return type_ == kIndefinite; } |
| |
| void Translate(size_t offset) { |
| DCHECK_EQ(type_, kUntranslatedDefinite); |
| |
| type_ = kTranslatedDefinite; |
| start_line_ += offset; |
| end_line_ += offset; |
| |
| DCHECK_GE(start_line_, 0); |
| DCHECK_GT(end_line_, 0); |
| } |
| |
| private: |
| enum GridSpanType { kUntranslatedDefinite, kTranslatedDefinite, kIndefinite }; |
| |
| GridSpan(int start_line, int end_line, GridSpanType type) : type_(type) { |
| #if DCHECK_IS_ON() |
| DCHECK_LT(start_line, end_line); |
| if (type == kTranslatedDefinite) { |
| DCHECK_GE(start_line, 0); |
| DCHECK_GT(end_line, 0); |
| } |
| #endif |
| |
| start_line_ = clampTo<int>(start_line, -kGridMaxTracks, kGridMaxTracks - 1); |
| end_line_ = clampTo<int>(end_line, -kGridMaxTracks + 1, kGridMaxTracks); |
| } |
| |
| int start_line_; |
| int end_line_; |
| GridSpanType type_; |
| }; |
| |
| // This represents a grid area that spans in both rows' and columns' direction. |
| struct GridArea { |
| USING_FAST_MALLOC(GridArea); |
| |
| public: |
| // HashMap requires a default constuctor. |
| GridArea() |
| : columns(GridSpan::IndefiniteGridSpan()), |
| rows(GridSpan::IndefiniteGridSpan()) {} |
| |
| GridArea(const GridSpan& r, const GridSpan& c) : columns(c), rows(r) {} |
| |
| bool operator==(const GridArea& o) const { |
| return columns == o.columns && rows == o.rows; |
| } |
| |
| bool operator!=(const GridArea& o) const { return !(*this == o); } |
| |
| GridSpan columns; |
| GridSpan rows; |
| }; |
| |
| typedef HashMap<String, GridArea> NamedGridAreaMap; |
| |
| } // namespace blink |
| |
| #endif // GridArea_h |