diff options
Diffstat (limited to 'ui/gfx/render_text.cc')
| -rwxr-xr-x | ui/gfx/render_text.cc | 506 |
1 files changed, 0 insertions, 506 deletions
diff --git a/ui/gfx/render_text.cc b/ui/gfx/render_text.cc deleted file mode 100755 index c656792..0000000 --- a/ui/gfx/render_text.cc +++ /dev/null @@ -1,506 +0,0 @@ -// Copyright (c) 2011 The Chromium Authors. All rights reserved. -// Use of this source code is governed by a BSD-style license that can be -// found in the LICENSE file. - -#include "ui/gfx/render_text.h" - -#include <algorithm> - -#include "base/i18n/break_iterator.h" -#include "base/logging.h" -#include "base/stl_util.h" -#include "ui/gfx/canvas.h" -#include "ui/gfx/canvas_skia.h" - -namespace { - -#ifndef NDEBUG -// Check StyleRanges invariant conditions: sorted and non-overlapping ranges. -void CheckStyleRanges(const gfx::StyleRanges& style_ranges, size_t length) { - if (length == 0) { - DCHECK(style_ranges.empty()) << "Style ranges exist for empty text."; - return; - } - for (gfx::StyleRanges::size_type i = 0; i < style_ranges.size() - 1; i++) { - const ui::Range& former = style_ranges[i].range; - const ui::Range& latter = style_ranges[i + 1].range; - DCHECK(!former.is_empty()) << "Empty range at " << i << ":" << former; - DCHECK(former.IsValid()) << "Invalid range at " << i << ":" << former; - DCHECK(!former.is_reversed()) << "Reversed range at " << i << ":" << former; - DCHECK(former.end() == latter.start()) << "Ranges gap/overlap/unsorted." << - "former:" << former << ", latter:" << latter; - } - const gfx::StyleRange& end_style = *style_ranges.rbegin(); - DCHECK(!end_style.range.is_empty()) << "Empty range at end."; - DCHECK(end_style.range.IsValid()) << "Invalid range at end."; - DCHECK(!end_style.range.is_reversed()) << "Reversed range at end."; - DCHECK(end_style.range.end() == length) << "Style and text length mismatch."; -} -#endif - -void ApplyStyleRangeImpl(gfx::StyleRanges& style_ranges, - gfx::StyleRange style_range) { - const ui::Range& new_range = style_range.range; - // Follow StyleRanges invariant conditions: sorted and non-overlapping ranges. - gfx::StyleRanges::iterator i; - for (i = style_ranges.begin(); i != style_ranges.end();) { - if (i->range.end() < new_range.start()) { - i++; - } else if (i->range.start() == new_range.end()) { - break; - } else if (new_range.Contains(i->range)) { - i = style_ranges.erase(i); - if (i == style_ranges.end()) - break; - } else if (i->range.start() < new_range.start() && - i->range.end() > new_range.end()) { - // Split the current style into two styles. - gfx::StyleRange split_style = gfx::StyleRange(*i); - split_style.range.set_end(new_range.start()); - i = style_ranges.insert(i, split_style) + 1; - i->range.set_start(new_range.end()); - break; - } else if (i->range.start() < new_range.start()) { - i->range.set_end(new_range.start()); - i++; - } else if (i->range.end() > new_range.end()) { - i->range.set_start(new_range.end()); - break; - } else - NOTREACHED(); - } - // Add the new range in its sorted location. - style_ranges.insert(i, style_range); -} - -} // namespace - -namespace gfx { - -StyleRange::StyleRange() - : font(), - foreground(SK_ColorBLACK), - strike(false), - underline(false), - range() { -} - -void RenderText::SetText(const string16& text) { - size_t old_text_length = text_.length(); - text_ = text; - - // Update the style ranges as needed. - if (text_.empty()) { - style_ranges_.clear(); - } else if (style_ranges_.empty()) { - ApplyDefaultStyle(); - } else if (text_.length() > old_text_length) { - style_ranges_.back().range.set_end(text_.length()); - } else if (text_.length() < old_text_length) { - StyleRanges::iterator i; - for (i = style_ranges_.begin(); i != style_ranges_.end(); i++) { - if (i->range.start() >= text_.length()) { - i = style_ranges_.erase(i); - if (i == style_ranges_.end()) - break; - } else if (i->range.end() > text_.length()) { - i->range.set_end(text_.length()); - } - } - style_ranges_.back().range.set_end(text_.length()); - } -#ifndef NDEBUG - CheckStyleRanges(style_ranges_, text_.length()); -#endif -} - -size_t RenderText::GetCursorPosition() const { - return GetSelection().end(); -} - -void RenderText::SetCursorPosition(const size_t position) { - SetSelection(ui::Range(position, position)); -} - -void RenderText::MoveCursorLeft(BreakType break_type, bool select) { - if (break_type == LINE_BREAK) { - MoveCursorTo(0, select); - return; - } - size_t position = GetCursorPosition(); - // Cancelling a selection moves to the edge of the selection. - if (!GetSelection().is_empty() && !select) { - // Use the selection start if it is left of the selection end. - if (GetCursorBounds(GetSelection().start(), false).x() < - GetCursorBounds(position, false).x()) - position = GetSelection().start(); - // If |move_by_word|, use the nearest word boundary left of the selection. - if (break_type == WORD_BREAK) - position = GetLeftCursorPosition(position, true); - } else { - position = GetLeftCursorPosition(position, break_type == WORD_BREAK); - } - MoveCursorTo(position, select); -} - -void RenderText::MoveCursorRight(BreakType break_type, bool select) { - if (break_type == LINE_BREAK) { - MoveCursorTo(text().length(), select); - return; - } - size_t position = GetCursorPosition(); - // Cancelling a selection moves to the edge of the selection. - if (!GetSelection().is_empty() && !select) { - // Use the selection start if it is right of the selection end. - if (GetCursorBounds(GetSelection().start(), false).x() > - GetCursorBounds(position, false).x()) - position = GetSelection().start(); - // If |move_by_word|, use the nearest word boundary right of the selection. - if (break_type == WORD_BREAK) - position = GetRightCursorPosition(position, true); - } else { - position = GetRightCursorPosition(position, break_type == WORD_BREAK); - } - MoveCursorTo(position, select); -} - -bool RenderText::MoveCursorTo(size_t position, bool select) { - bool changed = GetCursorPosition() != position || - select == GetSelection().is_empty(); - if (select) - SetSelection(ui::Range(GetSelection().start(), position)); - else - SetSelection(ui::Range(position, position)); - return changed; -} - -bool RenderText::MoveCursorTo(const gfx::Point& point, bool select) { - // TODO(msw): Make this function support cursor placement via mouse near BiDi - // level changes. The visual cursor appearance will depend on the location - // clicked, not solely the resulting logical cursor position. See the TODO - // note pertaining to selection_range_ for more information. - return MoveCursorTo(FindCursorPosition(point), select); -} - -const ui::Range& RenderText::GetSelection() const { - return selection_range_; -} - -void RenderText::SetSelection(const ui::Range& range) { - selection_range_.set_end(std::min(range.end(), text().length())); - selection_range_.set_start(std::min(range.start(), text().length())); - - // Update |display_offset_| to ensure the current cursor is visible. - gfx::Rect cursor_bounds(GetCursorBounds(GetCursorPosition(), insert_mode())); - int display_width = display_rect_.width(); - int string_width = GetStringWidth(); - if (string_width < display_width) { - // Show all text whenever the text fits to the size. - display_offset_.set_x(0); - } else if ((display_offset_.x() + cursor_bounds.right()) > display_width) { - // Pan to show the cursor when it overflows to the right, - display_offset_.set_x(display_width - cursor_bounds.right()); - } else if ((display_offset_.x() + cursor_bounds.x()) < 0) { - // Pan to show the cursor when it overflows to the left. - display_offset_.set_x(-cursor_bounds.x()); - } -} - -bool RenderText::IsPointInSelection(const gfx::Point& point) const { - size_t pos = FindCursorPosition(point); - return (pos >= GetSelection().GetMin() && pos < GetSelection().GetMax()); -} - -void RenderText::ClearSelection() { - SetCursorPosition(GetCursorPosition()); -} - -void RenderText::SelectAll() { - SetSelection(ui::Range(0, text().length())); -} - -void RenderText::SelectWord() { - size_t selection_start = GetSelection().start(); - size_t cursor_position = GetCursorPosition(); - // First we setup selection_start_ and cursor_pos_. There are so many cases - // because we try to emulate what select-word looks like in a gtk textfield. - // See associated testcase for different cases. - if (cursor_position > 0 && cursor_position < text().length()) { - if (isalnum(text()[cursor_position])) { - selection_start = cursor_position; - cursor_position++; - } else - selection_start = cursor_position - 1; - } else if (cursor_position == 0) { - selection_start = cursor_position; - if (text().length() > 0) - cursor_position++; - } else { - selection_start = cursor_position - 1; - } - - // Now we move selection_start_ to beginning of selection. Selection boundary - // is defined as the position where we have alpha-num character on one side - // and non-alpha-num char on the other side. - for (; selection_start > 0; selection_start--) { - if (IsPositionAtWordSelectionBoundary(selection_start)) - break; - } - - // Now we move cursor_pos_ to end of selection. Selection boundary - // is defined as the position where we have alpha-num character on one side - // and non-alpha-num char on the other side. - for (; cursor_position < text().length(); cursor_position++) { - if (IsPositionAtWordSelectionBoundary(cursor_position)) - break; - } - - SetSelection(ui::Range(selection_start, cursor_position)); -} - -const ui::Range& RenderText::GetCompositionRange() const { - return composition_range_; -} - -void RenderText::SetCompositionRange(const ui::Range& composition_range) { - CHECK(!composition_range.IsValid() || - ui::Range(0, text_.length()).Contains(composition_range)); - composition_range_.set_end(composition_range.end()); - composition_range_.set_start(composition_range.start()); -} - -void RenderText::ApplyStyleRange(StyleRange style_range) { - const ui::Range& new_range = style_range.range; - if (!new_range.IsValid() || new_range.is_empty()) - return; - CHECK(!new_range.is_reversed()); - CHECK(ui::Range(0, text_.length()).Contains(new_range)); - ApplyStyleRangeImpl(style_ranges_, style_range); -#ifndef NDEBUG - CheckStyleRanges(style_ranges_, text_.length()); -#endif -} - -void RenderText::ApplyDefaultStyle() { - style_ranges_.clear(); - StyleRange style = StyleRange(default_style_); - style.range.set_end(text_.length()); - style_ranges_.push_back(style); -} - -base::i18n::TextDirection RenderText::GetTextDirection() const { - // TODO(msw): Bidi implementation, intended to replace the functionality added - // in crrev.com/91881 (discussed in codereview.chromium.org/7324011). - return base::i18n::LEFT_TO_RIGHT; -} - -int RenderText::GetStringWidth() const { - return GetSubstringBounds(ui::Range(0, text_.length()))[0].width(); -} - -void RenderText::Draw(gfx::Canvas* canvas) { - // Clip the canvas to the text display area. - canvas->ClipRectInt(display_rect_.x(), display_rect_.y(), - display_rect_.width(), display_rect_.height()); - - // Draw the selection. - std::vector<gfx::Rect> selection(GetSubstringBounds(GetSelection())); - SkColor selection_color = - focused() ? kFocusedSelectionColor : kUnfocusedSelectionColor; - for (std::vector<gfx::Rect>::const_iterator i = selection.begin(); - i < selection.end(); ++i) { - gfx::Rect r(*i); - r.Offset(display_offset_); - canvas->FillRectInt(selection_color, r.x(), r.y(), r.width(), r.height()); - } - - // Create a temporary copy of the style ranges for composition and selection. - // TODO(msw): This pattern ought to be reconsidered; what about composition - // and selection overlaps, retain existing local style features? - StyleRanges style_ranges(style_ranges_); - // Apply a composition style override to a copy of the style ranges. - if (composition_range_.IsValid() && !composition_range_.is_empty()) { - StyleRange composition_style(default_style_); - composition_style.underline = true; - composition_style.range.set_start(composition_range_.start()); - composition_style.range.set_end(composition_range_.end()); - ApplyStyleRangeImpl(style_ranges, composition_style); - } - // Apply a selection style override to a copy of the style ranges. - if (selection_range_.IsValid() && !selection_range_.is_empty()) { - StyleRange selection_style(default_style_); - selection_style.foreground = kSelectedTextColor; - selection_style.range.set_start(selection_range_.GetMin()); - selection_style.range.set_end(selection_range_.GetMax()); - ApplyStyleRangeImpl(style_ranges, selection_style); - } - - // Draw the text. - gfx::Rect bounds(display_rect_); - bounds.Offset(display_offset_); - for (StyleRanges::const_iterator i = style_ranges.begin(); - i < style_ranges.end(); ++i) { - Font font = !i->underline ? i->font : - i->font.DeriveFont(0, i->font.GetStyle() | Font::UNDERLINED); - string16 text = text_.substr(i->range.start(), i->range.length()); - bounds.set_width(font.GetStringWidth(text)); - canvas->DrawStringInt(text, font, i->foreground, bounds); - - // Draw the strikethrough. - if (i->strike) { - SkPaint paint; - paint.setAntiAlias(true); - paint.setStyle(SkPaint::kFill_Style); - paint.setColor(i->foreground); - paint.setStrokeWidth(kStrikeWidth); - canvas->AsCanvasSkia()->drawLine(SkIntToScalar(bounds.x()), - SkIntToScalar(bounds.bottom()), - SkIntToScalar(bounds.right()), - SkIntToScalar(bounds.y()), - paint); - } - - bounds.set_x(bounds.x() + bounds.width()); - } - - // Paint cursor. Replace cursor is drawn as rectangle for now. - if (cursor_visible() && focused()) { - bounds = GetCursorBounds(GetCursorPosition(), insert_mode()); - bounds.Offset(display_offset_); - if (!bounds.IsEmpty()) - canvas->DrawRectInt(kCursorColor, - bounds.x(), - bounds.y(), - bounds.width(), - bounds.height()); - } -} - -size_t RenderText::FindCursorPosition(const gfx::Point& point) const { - const gfx::Font& font = Font(); - int left = 0; - int left_pos = 0; - int right = font.GetStringWidth(text()); - int right_pos = text().length(); - - int x = point.x(); - if (x <= left) return left_pos; - if (x >= right) return right_pos; - // binary searching the cursor position. - // TODO(oshima): use the center of character instead of edge. - // Binary search may not work for language like arabic. - while (std::abs(static_cast<long>(right_pos - left_pos) > 1)) { - int pivot_pos = left_pos + (right_pos - left_pos) / 2; - int pivot = font.GetStringWidth(text().substr(0, pivot_pos)); - if (pivot < x) { - left = pivot; - left_pos = pivot_pos; - } else if (pivot == x) { - return pivot_pos; - } else { - right = pivot; - right_pos = pivot_pos; - } - } - return left_pos; -} - -std::vector<gfx::Rect> RenderText::GetSubstringBounds( - const ui::Range& range) const { - size_t start = range.GetMin(); - size_t end = range.GetMax(); - gfx::Font font; - int start_x = font.GetStringWidth(text().substr(0, start)); - int end_x = font.GetStringWidth(text().substr(0, end)); - std::vector<gfx::Rect> bounds; - bounds.push_back(gfx::Rect(start_x, 0, end_x - start_x, font.GetHeight())); - return bounds; -} - -gfx::Rect RenderText::GetCursorBounds(size_t cursor_pos, - bool insert_mode) const { - gfx::Font font; - int x = font.GetStringWidth(text_.substr(0U, cursor_pos)); - DCHECK_GE(x, 0); - int h = std::min(display_rect_.height(), font.GetHeight()); - gfx::Rect bounds(x, (display_rect_.height() - h) / 2, 1, h); - if (!insert_mode && text_.length() != cursor_pos) - bounds.set_width(font.GetStringWidth(text_.substr(0, cursor_pos + 1)) - x); - return bounds; -} - -size_t RenderText::GetLeftCursorPosition(size_t position, - bool move_by_word) const { - if (!move_by_word) - return position == 0? position : position - 1; - // Notes: We always iterate words from the begining. - // This is probably fast enough for our usage, but we may - // want to modify WordIterator so that it can start from the - // middle of string and advance backwards. - base::i18n::BreakIterator iter(text(), base::i18n::BreakIterator::BREAK_WORD); - bool success = iter.Init(); - DCHECK(success); - if (!success) - return position; - int last = 0; - while (iter.Advance()) { - if (iter.IsWord()) { - size_t begin = iter.pos() - iter.GetString().length(); - if (begin == position) { - // The cursor is at the beginning of a word. - // Move to previous word. - break; - } else if(iter.pos() >= position) { - // The cursor is in the middle or at the end of a word. - // Move to the top of current word. - last = begin; - break; - } else { - last = iter.pos() - iter.GetString().length(); - } - } - } - - return last; -} - -size_t RenderText::GetRightCursorPosition(size_t position, - bool move_by_word) const { - if (!move_by_word) - return std::min(position + 1, text().length()); - base::i18n::BreakIterator iter(text(), base::i18n::BreakIterator::BREAK_WORD); - bool success = iter.Init(); - DCHECK(success); - if (!success) - return position; - size_t pos = 0; - while (iter.Advance()) { - pos = iter.pos(); - if (iter.IsWord() && pos > position) { - break; - } - } - return pos; -} - -RenderText::RenderText() - : text_(), - selection_range_(), - cursor_visible_(false), - insert_mode_(true), - composition_range_(), - style_ranges_(), - default_style_(), - display_rect_(), - display_offset_() { -} - -RenderText::~RenderText() { -} - -bool RenderText::IsPositionAtWordSelectionBoundary(size_t pos) { - return pos == 0 || (isalnum(text()[pos - 1]) && !isalnum(text()[pos])) || - (!isalnum(text()[pos - 1]) && isalnum(text()[pos])); -} - -} // namespace gfx |