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// Copyright (c) 2013 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.
#ifndef CHROME_BROWSER_UI_COCOA_AUTOFILL_SIMPLE_GRID_LAYOUT_H_
#define CHROME_BROWSER_UI_COCOA_AUTOFILL_SIMPLE_GRID_LAYOUT_H_
#import <Cocoa/Cocoa.h>
#include "base/memory/scoped_ptr.h"
#include "base/memory/scoped_vector.h"
class Column;
class ColumnSet;
class Row;
class ViewState;
// SimpleGridLayout is a layout manager that positions child views in a grid.
// Each row has exactly one ColumnSet, ColumnSets can be shared between rows.
// See ui/views/layout/grid_layout.h for more details - this is a very
// simplified version of the views class.
// This is based on GridLayout in ui/views/layout/grid_layout.h.
// TODO(groby): Unify both classes, create cross-platform abstraction.
// http://crbug.com/240461
class SimpleGridLayout {
public:
SimpleGridLayout(NSView* host);
~SimpleGridLayout();
// Creates a new column set with the specified id and returns it.
// The id is later used when starting a new row.
// Layout takes ownership of the ColumnSet and will delete it when
// it is deleted.
ColumnSet* AddColumnSet(int id);
// Returns the column set for the specified id, or NULL if one doesn't exist.
ColumnSet* GetColumnSet(int id);
// Adds a padding row. Padding rows typically don't have any views, but are
// used to provide vertical white space between views.
// |size| specifies the height of the row.
void AddPaddingRow(int size);
// Starts a new row with the specified column set.
void StartRow(float vertical_resize, int column_set_id);
// This is a convenience function that starts a new row,
// and returns a new ColumnSet associated with it. All rows created by this
// will have a height of 0 and resize_percent set to 1.0.
ColumnSet* AddRow();
// Advances past columns. Use this when the current column should not
// contain any views.
void SkipColumns(int col_count);
// TODO(groby): This currently *must* be called after a StartRow for the row
// the view is in. At some point, I'd like an AddView that just populates
// the next available slot, if possible.
void AddView(NSView* view);
// Layout all contained views according to constraints.
void Layout(NSView* superView);
void SizeRowsAndColumns(float width);
// Advances next_column_ past any padding columns.
void SkipPaddingColumns();
// Returns the column set of the last non-padding row.
ColumnSet* GetLastValidColumnSet();
// Get the height of a given row.
float GetRowHeight(int row);
// Y-position for a given row.
float GetRowLocation(int row_index) const;
// Get the preferred height for the given width.
float GetPreferredHeightForWidth(float with);
int num_rows() const { return static_cast<int>(rows_.size()); }
// These functions are mostly for testing & deviate from Views Layout class.
int next_column() { return next_column_; }
void AdvanceColumn() { next_column_++; }
private:
// Adds a new row, updating associated counters and positions.
void AddRow(Row* row);
// Next column in the current ColumnSet.
int next_column_;
int current_auto_id_; // Starting value for autogenerated columnset ids.
ScopedVector<ViewState> view_states_;
ScopedVector<ColumnSet> column_sets_;
ScopedVector<Row> rows_;
NSView* host_;
};
// ColumnSet is used to define a set of columns.
// You don't create a ColumnSet directly, instead use the AddRow method
// of SimpleGridLayout.
class ColumnSet {
public:
explicit ColumnSet(int id);
~ColumnSet();
void AddPaddingColumn(int fixed_width);
void AddColumn(float resize_percent);
void CalculateSize(float width);
void ResetColumnXCoordinates();
// ID of this ColumnSet.
int id() const { return id_; }
int num_columns() const { return static_cast<int>(columns_.size()); }
// Returns the width of the specified columns.
float GetColumnWidth(int column);
Column* GetColumn(int column_index) {
DCHECK(column_index >=0 && column_index < num_columns());
return columns_[column_index];
}
// These functions are mostly for testing & deviate from Views Layout class.
float ColumnLocation(int column_index);
private:
float CalculateRemainingWidth(float width);
void DistributeRemainingWidth(float width);
ScopedVector<Column> columns_;
int id_;
};
#endif // CHROME_BROWSER_UI_COCOA_AUTOFILL_SIMPLE_GRID_LAYOUT_H_
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