ButtonControlFrame.cpp (2227B)
1 /* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */ 2 /* vim: set ts=8 sts=2 et sw=2 tw=80: */ 3 /* This Source Code Form is subject to the terms of the Mozilla Public 4 * License, v. 2.0. If a copy of the MPL was not distributed with this 5 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */ 6 7 #include "ButtonControlFrame.h" 8 9 /* Abstract base class for special button frames (but not <button>) */ 10 11 using namespace mozilla; 12 13 namespace mozilla { 14 15 NS_QUERYFRAME_HEAD(ButtonControlFrame) 16 NS_QUERYFRAME_ENTRY(nsIAnonymousContentCreator) 17 NS_QUERYFRAME_ENTRY(ButtonControlFrame) 18 NS_QUERYFRAME_TAIL_INHERITING(nsBlockFrame) 19 20 void ButtonControlFrame::EnsureNonEmptyLabel(nsAString& aLabel) { 21 if (aLabel.IsEmpty()) { 22 // Have to use a space character of some sort for line-block-size 23 // calculations to be right. Also, the space character must be zero-width in 24 // order for the inline-size calculations to be consistent between 25 // size-contained comboboxes vs. empty comboboxes. 26 // 27 // XXXdholbert Does this space need to be "non-breaking"? I'm not sure if it 28 // matters, but we previously had a comment here (added in 2002) saying 29 // "Have to use a non-breaking space for line-height calculations to be 30 // right". So I'll stick with a non-breaking space for now... 31 aLabel = u"\ufeff"_ns; 32 } 33 } 34 35 nsresult ButtonControlFrame::HandleEvent(nsPresContext* aPresContext, 36 WidgetGUIEvent* aEvent, 37 nsEventStatus* aEventStatus) { 38 // Override HandleEvent to prevent the inherited version from being called 39 // when disabled. 40 if (IsContentDisabled()) { 41 return nsBlockFrame::HandleEvent(aPresContext, aEvent, aEventStatus); 42 } 43 return NS_OK; 44 } 45 46 void ButtonControlFrame::Reflow(nsPresContext* aPc, ReflowOutput& aReflowOutput, 47 const ReflowInput& aReflowInput, 48 nsReflowStatus& aStatus) { 49 nsBlockFrame::Reflow(aPc, aReflowOutput, aReflowInput, aStatus); 50 // We're always complete and we don't support overflow containers 51 // so we shouldn't have a next-in-flow ever. 52 aStatus.Reset(); 53 } 54 55 } // namespace mozilla