DXR is a code search and navigation tool aimed at making sense of large projects. It supports full-text and regex searches as well as structural queries.

Mercurial (d8847129d134)

VCS Links

Line Code
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273

/*
 * Copyright 2011 Google Inc.
 *
 * Use of this source code is governed by a BSD-style license that can be
 * found in the LICENSE file.
 */
#include "SkStackViewLayout.h"

SkStackViewLayout::SkStackViewLayout()
{
    fMargin.set(0, 0, 0, 0);
    fSpacer    = 0;
    fOrient    = kHorizontal_Orient;
    fPack    = kStart_Pack;
    fAlign    = kStart_Align;
    fRound    = false;
}

void SkStackViewLayout::setOrient(Orient ori)
{
    SkASSERT((unsigned)ori < kOrientCount);
    fOrient = SkToU8(ori);
}

void SkStackViewLayout::getMargin(SkRect* margin) const
{
    if (margin)
        *margin = fMargin;
}

void SkStackViewLayout::setMargin(const SkRect& margin)
{
    fMargin = margin;
}

void SkStackViewLayout::setSpacer(SkScalar spacer)
{
    fSpacer = spacer;
}

void SkStackViewLayout::setPack(Pack pack)
{
    SkASSERT((unsigned)pack < kPackCount);
    fPack = SkToU8(pack);
}

void SkStackViewLayout::setAlign(Align align)
{
    SkASSERT((unsigned)align < kAlignCount);
    fAlign = SkToU8(align);
}

void SkStackViewLayout::setRound(bool r)
{
    fRound = SkToU8(r);
}

////////////////////////////////////////////////////////////////////////////////

typedef SkScalar (*AlignProc)(SkScalar childLimit, SkScalar parentLimit);
typedef SkScalar (SkView::*GetSizeProc)() const;
typedef void (SkView::*SetLocProc)(SkScalar coord);
typedef void (SkView::*SetSizeProc)(SkScalar coord);

static SkScalar left_align_proc(SkScalar childLimit, SkScalar parentLimit) { return 0; }
static SkScalar center_align_proc(SkScalar childLimit, SkScalar parentLimit) { return SkScalarHalf(parentLimit - childLimit); }
static SkScalar right_align_proc(SkScalar childLimit, SkScalar parentLimit) { return parentLimit - childLimit; }
static SkScalar fill_align_proc(SkScalar childLimit, SkScalar parentLimit) { return 0; }

/*    Measure the main-dimension for all the children. If a child is marked flex in that direction
    ignore its current value but increment the counter for flexChildren
*/
static SkScalar compute_children_limit(SkView* parent, GetSizeProc sizeProc, int* count,
                                       uint32_t flexMask, int* flexCount)
{
    SkView::B2FIter    iter(parent);
    SkView*            child;
    SkScalar        limit = 0;
    int                n = 0, flex = 0;

    while ((child = iter.next()) != NULL)
    {
        n += 1;
        if (child->getFlags() & flexMask)
            flex += 1;
        else
            limit += (child->*sizeProc)();
    }
    if (count)
        *count = n;
    if (flexCount)
        *flexCount = flex;
    return limit;
}

void SkStackViewLayout::onLayoutChildren(SkView* parent)
{
    static AlignProc gAlignProcs[] = {
        left_align_proc,
        center_align_proc,
        right_align_proc,
        fill_align_proc
    };

    SkScalar            startM, endM, crossStartM, crossLimit;
    GetSizeProc            mainGetSizeP, crossGetSizeP;
    SetLocProc            mainLocP, crossLocP;
    SetSizeProc            mainSetSizeP, crossSetSizeP;
    SkView::Flag_Mask    flexMask;

    if (fOrient == kHorizontal_Orient)
    {
        startM        = fMargin.fLeft;
        endM        = fMargin.fRight;
        crossStartM    = fMargin.fTop;
        crossLimit    = -fMargin.fTop - fMargin.fBottom;

        mainGetSizeP    = &SkView::width;
        crossGetSizeP    = &SkView::height;
        mainLocP    = &SkView::setLocX;
        crossLocP    = &SkView::setLocY;

        mainSetSizeP  = &SkView::setWidth;
        crossSetSizeP = &SkView::setHeight;

        flexMask    = SkView::kFlexH_Mask;
    }
    else
    {
        startM        = fMargin.fTop;
        endM        = fMargin.fBottom;
        crossStartM    = fMargin.fLeft;
        crossLimit    = -fMargin.fLeft - fMargin.fRight;

        mainGetSizeP    = &SkView::height;
        crossGetSizeP    = &SkView::width;
        mainLocP    = &SkView::setLocY;
        crossLocP    = &SkView::setLocX;

        mainSetSizeP  = &SkView::setHeight;
        crossSetSizeP = &SkView::setWidth;

        flexMask    = SkView::kFlexV_Mask;
    }
    crossLimit += (parent->*crossGetSizeP)();
    if (fAlign != kStretch_Align)
        crossSetSizeP = NULL;

    int            childCount, flexCount;
    SkScalar    childLimit = compute_children_limit(parent, mainGetSizeP, &childCount, flexMask, &flexCount);

    if (childCount == 0)
        return;

    childLimit += (childCount - 1) * fSpacer;

    SkScalar        parentLimit = (parent->*mainGetSizeP)() - startM - endM;
    SkScalar        pos = startM + gAlignProcs[fPack](childLimit, parentLimit);
    SkScalar        flexAmount = 0;
    SkView::B2FIter    iter(parent);
    SkView*            child;

    if (flexCount > 0 && parentLimit > childLimit)
        flexAmount = (parentLimit - childLimit) / flexCount;

    while ((child = iter.next()) != NULL)
    {
        if (fRound)
            pos = SkScalarRoundToScalar(pos);
        (child->*mainLocP)(pos);
        SkScalar crossLoc = crossStartM + gAlignProcs[fAlign]((child->*crossGetSizeP)(), crossLimit);
        if (fRound)
            crossLoc = SkScalarRoundToScalar(crossLoc);
        (child->*crossLocP)(crossLoc);

        if (crossSetSizeP)
            (child->*crossSetSizeP)(crossLimit);
        if (child->getFlags() & flexMask)
            (child->*mainSetSizeP)(flexAmount);
        pos += (child->*mainGetSizeP)() + fSpacer;
    }
}

//////////////////////////////////////////////////////////////////////////////////////

#ifdef SK_DEBUG
    static void assert_no_attr(const SkDOM& dom, const SkDOM::Node* node, const char attr[])
    {
        const char* value = dom.findAttr(node, attr);
        if (value)
            SkDebugf("unknown attribute %s=\"%s\"\n", attr, value);
    }
#else
    #define assert_no_attr(dom, node, attr)
#endif

void SkStackViewLayout::onInflate(const SkDOM& dom, const SkDOM::Node* node)
{
    int            index;
    SkScalar    value[4];

    if ((index = dom.findList(node, "orient", "horizontal,vertical")) >= 0)
        this->setOrient((Orient)index);
    else {
        assert_no_attr(dom, node, "orient");
        }

    if (dom.findScalars(node, "margin", value, 4))
    {
        SkRect    margin;
        margin.set(value[0], value[1], value[2], value[3]);
        this->setMargin(margin);
    }
    else {
        assert_no_attr(dom, node, "margin");
        }

    if (dom.findScalar(node, "spacer", value))
        this->setSpacer(value[0]);
    else {
        assert_no_attr(dom, node, "spacer");
        }

    if ((index = dom.findList(node, "pack", "start,center,end")) >= 0)
        this->setPack((Pack)index);
    else {
        assert_no_attr(dom, node, "pack");
        }

    if ((index = dom.findList(node, "align", "start,center,end,stretch")) >= 0)
        this->setAlign((Align)index);
    else {
        assert_no_attr(dom, node, "align");
        }
}

///////////////////////////////////////////////////////////////////////////////////////////

SkFillViewLayout::SkFillViewLayout()
{
    fMargin.setEmpty();
}

void SkFillViewLayout::getMargin(SkRect* r) const
{
    if (r)
        *r = fMargin;
}

void SkFillViewLayout::setMargin(const SkRect& margin)
{
    fMargin = margin;
}

void SkFillViewLayout::onLayoutChildren(SkView* parent)
{
    SkView::B2FIter    iter(parent);
    SkView*            child;

    while ((child = iter.next()) != NULL)
    {
        child->setLoc(fMargin.fLeft, fMargin.fTop);
        child->setSize(    parent->width() - fMargin.fRight - fMargin.fLeft,
                        parent->height() - fMargin.fBottom - fMargin.fTop);
    }
}

void SkFillViewLayout::onInflate(const SkDOM& dom, const SkDOM::Node* node)
{
    this->INHERITED::onInflate(dom, node);
    (void)dom.findScalars(node, "margin", (SkScalar*)&fMargin, 4);
}