The Tor Browser / file comparison
comparison: layout/forms/nsHTMLButtonControlFrame.cpp
layout/forms/nsHTMLButtonControlFrame.cpp
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- TOR_BUG_9701
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- 97036ab72558
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| -1:000000000000 | 0:e1b9cc5f2412 |
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| 1 /* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */ | |
| 2 /* This Source Code Form is subject to the terms of the Mozilla Public | |
| 3 * License, v. 2.0. If a copy of the MPL was not distributed with this | |
| 4 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */ | |
| 5 | |
| 6 #include "nsHTMLButtonControlFrame.h" | |
| 7 | |
| 8 #include "nsContainerFrame.h" | |
| 9 #include "nsIFormControlFrame.h" | |
| 10 #include "nsPresContext.h" | |
| 11 #include "nsGkAtoms.h" | |
| 12 #include "nsButtonFrameRenderer.h" | |
| 13 #include "nsCSSAnonBoxes.h" | |
| 14 #include "nsFormControlFrame.h" | |
| 15 #include "nsNameSpaceManager.h" | |
| 16 #include "nsStyleSet.h" | |
| 17 #include "nsDisplayList.h" | |
| 18 #include <algorithm> | |
| 19 | |
| 20 using namespace mozilla; | |
| 21 | |
| 22 nsIFrame* | |
| 23 NS_NewHTMLButtonControlFrame(nsIPresShell* aPresShell, nsStyleContext* aContext) | |
| 24 { | |
| 25 return new (aPresShell) nsHTMLButtonControlFrame(aContext); | |
| 26 } | |
| 27 | |
| 28 NS_IMPL_FRAMEARENA_HELPERS(nsHTMLButtonControlFrame) | |
| 29 | |
| 30 nsHTMLButtonControlFrame::nsHTMLButtonControlFrame(nsStyleContext* aContext) | |
| 31 : nsContainerFrame(aContext) | |
| 32 { | |
| 33 } | |
| 34 | |
| 35 nsHTMLButtonControlFrame::~nsHTMLButtonControlFrame() | |
| 36 { | |
| 37 } | |
| 38 | |
| 39 void | |
| 40 nsHTMLButtonControlFrame::DestroyFrom(nsIFrame* aDestructRoot) | |
| 41 { | |
| 42 nsFormControlFrame::RegUnRegAccessKey(static_cast<nsIFrame*>(this), false); | |
| 43 nsContainerFrame::DestroyFrom(aDestructRoot); | |
| 44 } | |
| 45 | |
| 46 void | |
| 47 nsHTMLButtonControlFrame::Init( | |
| 48 nsIContent* aContent, | |
| 49 nsIFrame* aParent, | |
| 50 nsIFrame* aPrevInFlow) | |
| 51 { | |
| 52 nsContainerFrame::Init(aContent, aParent, aPrevInFlow); | |
| 53 mRenderer.SetFrame(this, PresContext()); | |
| 54 } | |
| 55 | |
| 56 NS_QUERYFRAME_HEAD(nsHTMLButtonControlFrame) | |
| 57 NS_QUERYFRAME_ENTRY(nsIFormControlFrame) | |
| 58 NS_QUERYFRAME_TAIL_INHERITING(nsContainerFrame) | |
| 59 | |
| 60 #ifdef ACCESSIBILITY | |
| 61 a11y::AccType | |
| 62 nsHTMLButtonControlFrame::AccessibleType() | |
| 63 { | |
| 64 return a11y::eHTMLButtonType; | |
| 65 } | |
| 66 #endif | |
| 67 | |
| 68 nsIAtom* | |
| 69 nsHTMLButtonControlFrame::GetType() const | |
| 70 { | |
| 71 return nsGkAtoms::HTMLButtonControlFrame; | |
| 72 } | |
| 73 | |
| 74 void | |
| 75 nsHTMLButtonControlFrame::SetFocus(bool aOn, bool aRepaint) | |
| 76 { | |
| 77 } | |
| 78 | |
| 79 nsresult | |
| 80 nsHTMLButtonControlFrame::HandleEvent(nsPresContext* aPresContext, | |
| 81 WidgetGUIEvent* aEvent, | |
| 82 nsEventStatus* aEventStatus) | |
| 83 { | |
| 84 // if disabled do nothing | |
| 85 if (mRenderer.isDisabled()) { | |
| 86 return NS_OK; | |
| 87 } | |
| 88 | |
| 89 // mouse clicks are handled by content | |
| 90 // we don't want our children to get any events. So just pass it to frame. | |
| 91 return nsFrame::HandleEvent(aPresContext, aEvent, aEventStatus); | |
| 92 } | |
| 93 | |
| 94 | |
| 95 void | |
| 96 nsHTMLButtonControlFrame::BuildDisplayList(nsDisplayListBuilder* aBuilder, | |
| 97 const nsRect& aDirtyRect, | |
| 98 const nsDisplayListSet& aLists) | |
| 99 { | |
| 100 nsDisplayList onTop; | |
| 101 if (IsVisibleForPainting(aBuilder)) { | |
| 102 mRenderer.DisplayButton(aBuilder, aLists.BorderBackground(), &onTop); | |
| 103 } | |
| 104 | |
| 105 nsDisplayListCollection set; | |
| 106 | |
| 107 // Do not allow the child subtree to receive events. | |
| 108 if (!aBuilder->IsForEventDelivery()) { | |
| 109 DisplayListClipState::AutoSaveRestore clipState(aBuilder); | |
| 110 | |
| 111 if (IsInput() || StyleDisplay()->mOverflowX != NS_STYLE_OVERFLOW_VISIBLE) { | |
| 112 nsMargin border = StyleBorder()->GetComputedBorder(); | |
| 113 nsRect rect(aBuilder->ToReferenceFrame(this), GetSize()); | |
| 114 rect.Deflate(border); | |
| 115 nscoord radii[8]; | |
| 116 bool hasRadii = GetPaddingBoxBorderRadii(radii); | |
| 117 clipState.ClipContainingBlockDescendants(rect, hasRadii ? radii : nullptr); | |
| 118 } | |
| 119 | |
| 120 BuildDisplayListForChild(aBuilder, mFrames.FirstChild(), aDirtyRect, set, | |
| 121 DISPLAY_CHILD_FORCE_PSEUDO_STACKING_CONTEXT); | |
| 122 // That should put the display items in set.Content() | |
| 123 } | |
| 124 | |
| 125 // Put the foreground outline and focus rects on top of the children | |
| 126 set.Content()->AppendToTop(&onTop); | |
| 127 set.MoveTo(aLists); | |
| 128 | |
| 129 DisplayOutline(aBuilder, aLists); | |
| 130 | |
| 131 // to draw border when selected in editor | |
| 132 DisplaySelectionOverlay(aBuilder, aLists.Content()); | |
| 133 } | |
| 134 | |
| 135 nscoord | |
| 136 nsHTMLButtonControlFrame::GetMinWidth(nsRenderingContext* aRenderingContext) | |
| 137 { | |
| 138 nscoord result; | |
| 139 DISPLAY_MIN_WIDTH(this, result); | |
| 140 | |
| 141 nsIFrame* kid = mFrames.FirstChild(); | |
| 142 result = nsLayoutUtils::IntrinsicForContainer(aRenderingContext, | |
| 143 kid, | |
| 144 nsLayoutUtils::MIN_WIDTH); | |
| 145 | |
| 146 result += mRenderer.GetAddedButtonBorderAndPadding().LeftRight(); | |
| 147 | |
| 148 return result; | |
| 149 } | |
| 150 | |
| 151 nscoord | |
| 152 nsHTMLButtonControlFrame::GetPrefWidth(nsRenderingContext* aRenderingContext) | |
| 153 { | |
| 154 nscoord result; | |
| 155 DISPLAY_PREF_WIDTH(this, result); | |
| 156 | |
| 157 nsIFrame* kid = mFrames.FirstChild(); | |
| 158 result = nsLayoutUtils::IntrinsicForContainer(aRenderingContext, | |
| 159 kid, | |
| 160 nsLayoutUtils::PREF_WIDTH); | |
| 161 result += mRenderer.GetAddedButtonBorderAndPadding().LeftRight(); | |
| 162 return result; | |
| 163 } | |
| 164 | |
| 165 nsresult | |
| 166 nsHTMLButtonControlFrame::Reflow(nsPresContext* aPresContext, | |
| 167 nsHTMLReflowMetrics& aDesiredSize, | |
| 168 const nsHTMLReflowState& aReflowState, | |
| 169 nsReflowStatus& aStatus) | |
| 170 { | |
| 171 DO_GLOBAL_REFLOW_COUNT("nsHTMLButtonControlFrame"); | |
| 172 DISPLAY_REFLOW(aPresContext, this, aReflowState, aDesiredSize, aStatus); | |
| 173 | |
| 174 NS_PRECONDITION(aReflowState.ComputedWidth() != NS_INTRINSICSIZE, | |
| 175 "Should have real computed width by now"); | |
| 176 | |
| 177 if (mState & NS_FRAME_FIRST_REFLOW) { | |
| 178 nsFormControlFrame::RegUnRegAccessKey(static_cast<nsIFrame*>(this), true); | |
| 179 } | |
| 180 | |
| 181 // Reflow the child | |
| 182 nsIFrame* firstKid = mFrames.FirstChild(); | |
| 183 | |
| 184 MOZ_ASSERT(firstKid, "Button should have a child frame for its contents"); | |
| 185 MOZ_ASSERT(!firstKid->GetNextSibling(), | |
| 186 "Button should have exactly one child frame"); | |
| 187 MOZ_ASSERT(firstKid->StyleContext()->GetPseudo() == | |
| 188 nsCSSAnonBoxes::buttonContent, | |
| 189 "Button's child frame has unexpected pseudo type!"); | |
| 190 | |
| 191 // XXXbz Eventually we may want to check-and-bail if | |
| 192 // !aReflowState.ShouldReflowAllKids() && | |
| 193 // !NS_SUBTREE_DIRTY(firstKid). | |
| 194 // We'd need to cache our ascent for that, of course. | |
| 195 | |
| 196 // Reflow the contents of the button. | |
| 197 // (This populates our aDesiredSize, too.) | |
| 198 ReflowButtonContents(aPresContext, aDesiredSize, | |
| 199 aReflowState, firstKid); | |
| 200 | |
| 201 ConsiderChildOverflow(aDesiredSize.mOverflowAreas, firstKid); | |
| 202 | |
| 203 aStatus = NS_FRAME_COMPLETE; | |
| 204 FinishReflowWithAbsoluteFrames(aPresContext, aDesiredSize, | |
| 205 aReflowState, aStatus); | |
| 206 | |
| 207 NS_FRAME_SET_TRUNCATION(aStatus, aReflowState, aDesiredSize); | |
| 208 return NS_OK; | |
| 209 } | |
| 210 | |
| 211 // Helper-function that lets us clone the button's reflow state, but with its | |
| 212 // ComputedWidth and ComputedHeight reduced by the amount of renderer-specific | |
| 213 // focus border and padding that we're using. (This lets us provide a more | |
| 214 // appropriate content-box size for descendents' percent sizes to resolve | |
| 215 // against.) | |
| 216 static nsHTMLReflowState | |
| 217 CloneReflowStateWithReducedContentBox( | |
| 218 const nsHTMLReflowState& aButtonReflowState, | |
| 219 const nsMargin& aFocusPadding) | |
| 220 { | |
| 221 nscoord adjustedWidth = | |
| 222 aButtonReflowState.ComputedWidth() - aFocusPadding.LeftRight(); | |
| 223 adjustedWidth = std::max(0, adjustedWidth); | |
| 224 | |
| 225 // (Only adjust height if it's an actual length.) | |
| 226 nscoord adjustedHeight = aButtonReflowState.ComputedHeight(); | |
| 227 if (adjustedHeight != NS_INTRINSICSIZE) { | |
| 228 adjustedHeight -= aFocusPadding.TopBottom(); | |
| 229 adjustedHeight = std::max(0, adjustedHeight); | |
| 230 } | |
| 231 | |
| 232 nsHTMLReflowState clone(aButtonReflowState); | |
| 233 clone.SetComputedWidth(adjustedWidth); | |
| 234 clone.SetComputedHeight(adjustedHeight); | |
| 235 | |
| 236 return clone; | |
| 237 } | |
| 238 | |
| 239 void | |
| 240 nsHTMLButtonControlFrame::ReflowButtonContents(nsPresContext* aPresContext, | |
| 241 nsHTMLReflowMetrics& aButtonDesiredSize, | |
| 242 const nsHTMLReflowState& aButtonReflowState, | |
| 243 nsIFrame* aFirstKid) | |
| 244 { | |
| 245 // Buttons have some bonus renderer-determined border/padding, | |
| 246 // which occupies part of the button's content-box area: | |
| 247 const nsMargin focusPadding = mRenderer.GetAddedButtonBorderAndPadding(); | |
| 248 | |
| 249 nsSize availSize(aButtonReflowState.ComputedWidth(), NS_INTRINSICSIZE); | |
| 250 | |
| 251 // Indent the child inside us by the focus border. We must do this separate | |
| 252 // from the regular border. | |
| 253 availSize.width -= focusPadding.LeftRight(); | |
| 254 | |
| 255 // See whether out availSize's width is big enough. If it's smaller than our | |
| 256 // intrinsic min width, that means that the kid wouldn't really fit; for a | |
| 257 // better look in such cases we adjust the available width and our left | |
| 258 // offset to allow the kid to spill left into our padding. | |
| 259 nscoord xoffset = focusPadding.left + | |
| 260 aButtonReflowState.ComputedPhysicalBorderPadding().left; | |
| 261 nscoord extrawidth = GetMinWidth(aButtonReflowState.rendContext) - | |
| 262 aButtonReflowState.ComputedWidth(); | |
| 263 if (extrawidth > 0) { | |
| 264 nscoord extraleft = extrawidth / 2; | |
| 265 nscoord extraright = extrawidth - extraleft; | |
| 266 NS_ASSERTION(extraright >=0, "How'd that happen?"); | |
| 267 | |
| 268 // Do not allow the extras to be bigger than the relevant padding | |
| 269 extraleft = std::min(extraleft, aButtonReflowState.ComputedPhysicalPadding().left); | |
| 270 extraright = std::min(extraright, aButtonReflowState.ComputedPhysicalPadding().right); | |
| 271 xoffset -= extraleft; | |
| 272 availSize.width += extraleft + extraright; | |
| 273 } | |
| 274 availSize.width = std::max(availSize.width,0); | |
| 275 | |
| 276 // Give child a clone of the button's reflow state, with height/width reduced | |
| 277 // by focusPadding, so that descendants with height:100% don't protrude. | |
| 278 nsHTMLReflowState adjustedButtonReflowState = | |
| 279 CloneReflowStateWithReducedContentBox(aButtonReflowState, focusPadding); | |
| 280 | |
| 281 nsHTMLReflowState contentsReflowState(aPresContext, | |
| 282 adjustedButtonReflowState, | |
| 283 aFirstKid, availSize); | |
| 284 | |
| 285 nsReflowStatus contentsReflowStatus; | |
| 286 nsHTMLReflowMetrics contentsDesiredSize(aButtonReflowState); | |
| 287 ReflowChild(aFirstKid, aPresContext, | |
| 288 contentsDesiredSize, contentsReflowState, | |
| 289 xoffset, | |
| 290 focusPadding.top + aButtonReflowState.ComputedPhysicalBorderPadding().top, | |
| 291 0, contentsReflowStatus); | |
| 292 MOZ_ASSERT(NS_FRAME_IS_COMPLETE(contentsReflowStatus), | |
| 293 "We gave button-contents frame unconstrained available height, " | |
| 294 "so it should be complete"); | |
| 295 | |
| 296 // Compute the button's content-box height: | |
| 297 nscoord buttonContentBoxHeight = 0; | |
| 298 if (aButtonReflowState.ComputedHeight() != NS_INTRINSICSIZE) { | |
| 299 // Button has a fixed height -- that's its content-box height. | |
| 300 buttonContentBoxHeight = aButtonReflowState.ComputedHeight(); | |
| 301 } else { | |
| 302 // Button is intrinsically sized -- it should shrinkwrap the | |
| 303 // button-contents' height, plus any focus-padding space: | |
| 304 buttonContentBoxHeight = | |
| 305 contentsDesiredSize.Height() + focusPadding.TopBottom(); | |
| 306 | |
| 307 // Make sure we obey min/max-height in the case when we're doing intrinsic | |
| 308 // sizing (we get it for free when we have a non-intrinsic | |
| 309 // aButtonReflowState.ComputedHeight()). Note that we do this before | |
| 310 // adjusting for borderpadding, since mComputedMaxHeight and | |
| 311 // mComputedMinHeight are content heights. | |
| 312 buttonContentBoxHeight = | |
| 313 NS_CSS_MINMAX(buttonContentBoxHeight, | |
| 314 aButtonReflowState.ComputedMinHeight(), | |
| 315 aButtonReflowState.ComputedMaxHeight()); | |
| 316 } | |
| 317 | |
| 318 // Center child vertically in the button | |
| 319 // (technically, inside of the button's focus-padding area) | |
| 320 nscoord extraSpace = | |
| 321 buttonContentBoxHeight - focusPadding.TopBottom() - | |
| 322 contentsDesiredSize.Height(); | |
| 323 | |
| 324 nscoord yoffset = std::max(0, extraSpace / 2); | |
| 325 | |
| 326 // Adjust yoffset to be in terms of the button's frame-rect, instead of | |
| 327 // its focus-padding rect: | |
| 328 yoffset += focusPadding.top + aButtonReflowState.ComputedPhysicalBorderPadding().top; | |
| 329 | |
| 330 // Place the child | |
| 331 FinishReflowChild(aFirstKid, aPresContext, | |
| 332 contentsDesiredSize, &contentsReflowState, | |
| 333 xoffset, yoffset, 0); | |
| 334 | |
| 335 // Make sure we have a useful 'ascent' value for the child | |
| 336 if (contentsDesiredSize.TopAscent() == nsHTMLReflowMetrics::ASK_FOR_BASELINE) { | |
| 337 contentsDesiredSize.SetTopAscent(aFirstKid->GetBaseline()); | |
| 338 } | |
| 339 | |
| 340 // OK, we're done with the child frame. | |
| 341 // Use what we learned to populate the button frame's reflow metrics. | |
| 342 // * Button's height & width are content-box size + border-box contribution: | |
| 343 aButtonDesiredSize.Width() = aButtonReflowState.ComputedWidth() + | |
| 344 aButtonReflowState.ComputedPhysicalBorderPadding().LeftRight(); | |
| 345 | |
| 346 aButtonDesiredSize.Height() = buttonContentBoxHeight + | |
| 347 aButtonReflowState.ComputedPhysicalBorderPadding().TopBottom(); | |
| 348 | |
| 349 // * Button's ascent is its child's ascent, plus the child's y-offset | |
| 350 // within our frame: | |
| 351 aButtonDesiredSize.SetTopAscent(contentsDesiredSize.TopAscent() + yoffset); | |
| 352 | |
| 353 aButtonDesiredSize.SetOverflowAreasToDesiredBounds(); | |
| 354 } | |
| 355 | |
| 356 nsresult nsHTMLButtonControlFrame::SetFormProperty(nsIAtom* aName, const nsAString& aValue) | |
| 357 { | |
| 358 if (nsGkAtoms::value == aName) { | |
| 359 return mContent->SetAttr(kNameSpaceID_None, nsGkAtoms::value, | |
| 360 aValue, true); | |
| 361 } | |
| 362 return NS_OK; | |
| 363 } | |
| 364 | |
| 365 nsStyleContext* | |
| 366 nsHTMLButtonControlFrame::GetAdditionalStyleContext(int32_t aIndex) const | |
| 367 { | |
| 368 return mRenderer.GetStyleContext(aIndex); | |
| 369 } | |
| 370 | |
| 371 void | |
| 372 nsHTMLButtonControlFrame::SetAdditionalStyleContext(int32_t aIndex, | |
| 373 nsStyleContext* aStyleContext) | |
| 374 { | |
| 375 mRenderer.SetStyleContext(aIndex, aStyleContext); | |
| 376 } | |
| 377 | |
| 378 nsresult | |
| 379 nsHTMLButtonControlFrame::AppendFrames(ChildListID aListID, | |
| 380 nsFrameList& aFrameList) | |
| 381 { | |
| 382 NS_NOTREACHED("unsupported operation"); | |
| 383 return NS_ERROR_UNEXPECTED; | |
| 384 } | |
| 385 | |
| 386 nsresult | |
| 387 nsHTMLButtonControlFrame::InsertFrames(ChildListID aListID, | |
| 388 nsIFrame* aPrevFrame, | |
| 389 nsFrameList& aFrameList) | |
| 390 { | |
| 391 NS_NOTREACHED("unsupported operation"); | |
| 392 return NS_ERROR_UNEXPECTED; | |
| 393 } | |
| 394 | |
| 395 nsresult | |
| 396 nsHTMLButtonControlFrame::RemoveFrame(ChildListID aListID, | |
| 397 nsIFrame* aOldFrame) | |
| 398 { | |
| 399 NS_NOTREACHED("unsupported operation"); | |
| 400 return NS_ERROR_UNEXPECTED; | |
| 401 } |
