author Boris Zbarsky <>
Sat, 11 May 2019 08:28:29 +0000
changeset 532359 6103006e3172f0ef258a30256b8cc7a6553e7f14
parent 531989 e77c2a2c5d8238d23de731605789269873ecd97e
child 540150 98f100abc2ba9226fabcddda36647f32fd4cae23
permissions -rw-r--r--
Bug 1550937. Stop using [array] in nsIEventListenerService. r=smaug Differential Revision:

/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set ts=8 sts=2 et sw=2 tw=80: */
/* This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at */

/* A namespace class for static muti-column utilities. */

#ifndef mozilla_ColumnUtils_h
#define mozilla_ColumnUtils_h

#include "nsStyleCoord.h"

class nsContainerFrame;

namespace mozilla {

// ColumnUtils is a namespace class containing utility functions used by
// multi-column containers like ColumnSetWrapperFrame and nsColumnSetFrame.
class ColumnUtils final {
  // Compute used value of 'column-gap' for aFrame.
  static nscoord GetColumnGap(const nsContainerFrame* aFrame,
                              nscoord aPercentageBasis);

  // Clamp used column width to a minimum of 1px.
  static nscoord ClampUsedColumnWidth(const Length& aColumnWidth);

  // Compute the intrinsic inline-size of a column container, given a non-zero
  // column-count, column gap, and column box's inline-size.
  static nscoord IntrinsicISize(uint32_t aColCount, nscoord aColGap,
                                nscoord aColISize);

}  // namespace mozilla

#endif  // mozilla_ColumnUtils_h