FreeLayout class
The free layout (default).
class FreeLayout extends AbstractLayout {
int measureWidth(MeasureContext mctx, View view) {
int wd = mctx.getWidthByApp(view);
if (wd == null) {
wd = view.clientWidth;
for (final View child in view.children) {
if (view.shallLayout_(child) && child.profile.anchorView == null) {
int subsz = child.measureWidth_(mctx);
subsz = child.left + (subsz != null ? subsz: 0);
if (wd == null || subsz > wd)
wd = subsz;
}
}
if (wd != null)
wd += mctx.getBorderWidth(view);
}
return wd;
}
int measureHeight(MeasureContext mctx, View view) {
int hgh = mctx.getHeightByApp(view);
if (hgh == null) {
hgh = view.clientHeight;
for (final View child in view.children) {
if (view.shallLayout_(child) && child.profile.anchorView == null) {
int subsz = child.measureHeight_(mctx);
subsz = child.top + (subsz != null ? subsz: 0);
if (hgh == null || subsz > hgh)
hgh = subsz;
}
}
if (hgh != null)
hgh += mctx.getBorderHeight(view);
}
return hgh;
}
bool get isProfileInherited => false;
void doLayout_(MeasureContext mctx, View view, List<View> children) {
final AsInt clientWidth = () => view.clientWidth,
clientHeight = () => view.clientHeight; //future: introduce cache
for (final View child in children) {
mctx.setWidthByProfile(child, clientWidth);
mctx.setHeightByProfile(child, clientHeight);
}
}
}
Extends
Layout > AbstractLayout > FreeLayout
Properties
final bool isProfileInherited #
Default: true.
docs inherited from AbstractLayout
bool get isProfileInherited => false;
Methods
void doLayout(MeasureContext mctx, View view) #
inherited from AbstractLayout
Handles the layout of the given view.
docs inherited from Layout
void doLayout(MeasureContext mctx, View view) {
if (view.firstChild != null) {
final AnchorRelation ar = new AnchorRelation(view);
for (final View child in ar.indeps) {
mctx.preLayout(child);
//unlike View.onLayout_, the layout shall invoke mctx.preLayout
}
//1) layout independents
doLayout_(mctx, view, ar.indeps);
//2) do anchored
ar.layoutAnchored(mctx);
//3) pass control to children
for (final View child in view.children) {
if (child.visible)
child.doLayout_(mctx); //no matter shallLayout_(child)
}
}
}
void doLayout_(MeasureContext mctx, View view, List<View> children) #
Arranges the layout of non-anchored views. Instead of overriding doLayout, it is simpler to override this method.
docs inherited from AbstractLayout
void doLayout_(MeasureContext mctx, View view, List<View> children) {
final AsInt clientWidth = () => view.clientWidth,
clientHeight = () => view.clientHeight; //future: introduce cache
for (final View child in children) {
mctx.setWidthByProfile(child, clientWidth);
mctx.setHeightByProfile(child, clientHeight);
}
}
int measureHeight(MeasureContext mctx, View view) #
Measure the height of the given view.
docs inherited from Layout
int measureHeight(MeasureContext mctx, View view) {
int hgh = mctx.getHeightByApp(view);
if (hgh == null) {
hgh = view.clientHeight;
for (final View child in view.children) {
if (view.shallLayout_(child) && child.profile.anchorView == null) {
int subsz = child.measureHeight_(mctx);
subsz = child.top + (subsz != null ? subsz: 0);
if (hgh == null || subsz > hgh)
hgh = subsz;
}
}
if (hgh != null)
hgh += mctx.getBorderHeight(view);
}
return hgh;
}
int measureWidth(MeasureContext mctx, View view) #
Measure the width of the given view.
docs inherited from Layout
int measureWidth(MeasureContext mctx, View view) {
int wd = mctx.getWidthByApp(view);
if (wd == null) {
wd = view.clientWidth;
for (final View child in view.children) {
if (view.shallLayout_(child) && child.profile.anchorView == null) {
int subsz = child.measureWidth_(mctx);
subsz = child.left + (subsz != null ? subsz: 0);
if (wd == null || subsz > wd)
wd = subsz;
}
}
if (wd != null)
wd += mctx.getBorderWidth(view);
}
return wd;
}