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// Copyright (c) 2010 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.
// This file defines utility functions for working with text in views.
#pragma once
#include <string>
#include "ui/gfx/font.h"
#include "ui/gfx/rect.h"
namespace gfx {
class Canvas;
class Size;
namespace views {
class Label;
class Link;
namespace view_text_utils {
// Draws a string onto the canvas (wrapping if needed) while also keeping
// track of where it ends so we can position a URL after the text. The
// parameter |bounds| represents the boundary we have to work with, |position|
// specifies where to draw the string (relative to the top left corner of the
// |bounds| rectangle and |font| specifies the font to use when drawing. When
// the function returns, the parameter |rect| contains where to draw the URL
// (to the right of where we just drew the text) and |position| is updated to
// reflect where to draw the next string after the URL. |label| is a dummy
// label with the correct width and origin for the text to be written; it's
// used so that the x position can be correctly mirrored in RTL languages.
// |text_direction_is_rtl| is true if an RTL language is being used.
// NOTE: The reason why we need this function is because while Skia knows how
// to wrap text appropriately, it doesn't tell us where it drew the last
// character, which we need to position the URLs within the text.
void DrawTextAndPositionUrl(gfx::Canvas* canvas,
views::Label* label,
const std::wstring& text,
views::Link* link,
gfx::Rect* rect,
gfx::Size* position,
bool text_direction_is_rtl,
const gfx::Rect& bounds,
const gfx::Font& font);
// A helper function for DrawTextAndPositionUrl, which simply draws the text
// from a certain starting point |position| and wraps within bounds.
// |word_for_word| specifies whether to draw the text word for word or whether
// to treat the text as one blurb (similar to the way URL's are treated inside
// RTL text. For details on the other parameters, see DrawTextAndPositionUrl.
void DrawTextStartingFrom(gfx::Canvas* canvas,
views::Label* label,
const std::wstring& text,
gfx::Size* position,
const gfx::Rect& bounds,
const gfx::Font& font,
bool text_direction_is_rtl,
bool word_for_word);
// A simply utility function that calculates whether a word of width
// |word_width| fits at position |position| within the |bounds| rectangle. If
// not, |position| is updated to wrap to the beginning of the next line.
void WrapIfWordDoesntFit(int word_width,
int font_height,
gfx::Size* position,
const gfx::Rect& bounds);
} // namespace view_text_utils