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Code Issues Packages Projects Releases Wiki Activity

scrollbar, part 3

This commit is contained in:
Vadim Lopatin 2014-03-24 13:53:49 +04:00
parent 6c60828690
commit 502ea57e42
3 changed files with 161 additions and 1 deletions
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1
src/dlangui/platforms/common/platform.d
View File

@ -106,6 +106,7 @@ class Window {
if (event.action == MouseAction.ButtonDown && _mouseCaptureWidget is null) {
Log.d("Setting active widget");
_mouseCaptureWidget = root;
_mouseCaptureButtons = event.flags & (MouseFlag.LButton|MouseFlag.RButton|MouseFlag.MButton);
} else if (event.action == MouseAction.Move && _mouseTrackingWidget is null) {
Log.d("Setting tracking widget");
_mouseTrackingWidget = root;

157
src/dlangui/widgets/controls.d
View File

@ -151,10 +151,130 @@ class Button : Widget {
}
/// scroll bar - either vertical or horizontal
class ScrollBar : WidgetGroup {
class ScrollBar : WidgetGroup, OnClickHandler {
protected ImageButton _btnBack;
protected ImageButton _btnForward;
protected ImageButton _indicator;
protected Rect _scrollArea;
protected int _btnSize;
protected int _minIndicatorSize;
protected int _minValue = 0;
protected int _maxValue = 100;
protected int _pageSize = 30;
protected int _position = 20;
class IndicatorButton : ImageButton {
Point _dragStart;
int _dragStartPosition;
bool _dragging;
Rect _dragStartRect;
this(string resourceId) {
super("INDICATOR", resourceId);
}
/// process mouse event; return true if event is processed by widget.
override bool onMouseEvent(MouseEvent event) {
// support onClick
if (event.action == MouseAction.ButtonDown && event.button == MouseButton.Left) {
setState(State.Pressed);
_dragging = true;
_dragStart.x = event.x;
_dragStart.y = event.y;
_dragStartPosition = _position;
_dragStartRect = _pos;
return true;
}
if (event.action == MouseAction.Move && _dragging) {
int delta = _orientation == Orientation.Vertical ? event.y - _dragStart.y : event.x - _dragStart.x;
Rect rc = _dragStartRect;
int offset;
int space;
if (_orientation == Orientation.Vertical) {
rc.top += delta;
rc.bottom += delta;
if (rc.top < _scrollArea.top) {
rc.top = _scrollArea.top;
rc.bottom = _scrollArea.top + _dragStartRect.height;
} else if (rc.bottom > _scrollArea.bottom) {
rc.top = _scrollArea.top - _dragStartRect.height;
rc.bottom = _scrollArea.bottom;
}
offset = rc.top - _scrollArea.top;
space = _scrollArea.height - rc.height;
} else {
rc.left += delta;
rc.right += delta;
if (rc.left < _scrollArea.left) {
rc.left = _scrollArea.left;
rc.right = _scrollArea.left + _dragStartRect.width;
} else if (rc.right > _scrollArea.right) {
rc.left = _scrollArea.right - _dragStartRect.width;
rc.right = _scrollArea.right;
}
offset = rc.left - _scrollArea.left;
space = _scrollArea.width - rc.width;
}
_pos = rc;
int position = space > 0 ? _minValue + offset * (_maxValue - _minValue - _pageSize) / space : 0;
invalidate();
onIndicatorDragging(_dragStartPosition, position);
return true;
}
if (event.action == MouseAction.ButtonUp && event.button == MouseButton.Left) {
resetState(State.Pressed);
if (_dragging) {
_dragging = false;
}
return true;
}
if (event.action == MouseAction.Cancel) {
Log.d("IndicatorButton.onMouseEvent event.action == MouseAction.Cancel");
resetState(State.Pressed);
_dragging = false;
return true;
}
return false;
}
}
protected bool onIndicatorDragging(int initialPosition, int currentPosition) {
_position = currentPosition;
return true;
}
private bool calcButtonSizes(int availableSize, ref int spaceBackSize, ref int spaceForwardSize, ref int indicatorSize) {
int dv = _maxValue - _minValue;
if (_pageSize >= dv) {
// full size
spaceBackSize = spaceForwardSize = 0;
indicatorSize = availableSize;
return false;
}
if (dv < 0)
dv = 0;
indicatorSize = _pageSize * availableSize / dv;
if (indicatorSize < _minIndicatorSize)
indicatorSize = _minIndicatorSize;
if (indicatorSize >= availableSize) {
// full size
spaceBackSize = spaceForwardSize = 0;
indicatorSize = availableSize;
return false;
}
int spaceLeft = availableSize - indicatorSize;
int topv = _position - _minValue;
int bottomv = _position + _pageSize - _minValue;
if (topv < 0)
topv = 0;
if (bottomv > dv)
bottomv = dv;
bottomv = dv - bottomv;
spaceBackSize = spaceLeft * topv / (topv + bottomv);
spaceForwardSize = spaceLeft - spaceBackSize;
return true;
}
protected Orientation _orientation = Orientation.Vertical;
/// returns scrollbar orientation (Vertical, Horizontal)
@ -165,6 +285,7 @@ class ScrollBar : WidgetGroup {
_orientation = value;
_btnBack.drawableId = _orientation == Orientation.Vertical ? "scrollbar_btn_up" : "scrollbar_btn_left";
_btnForward.drawableId = _orientation == Orientation.Vertical ? "scrollbar_btn_down" : "scrollbar_btn_right";
_indicator.drawableId = _orientation == Orientation.Vertical ? "scrollbar_indicator_vertical" : "scrollbar_indicator_horizontal";
requestLayout();
}
return this;
@ -176,15 +297,21 @@ class ScrollBar : WidgetGroup {
_orientation = orient;
_btnBack = new ImageButton("BACK", _orientation == Orientation.Vertical ? "scrollbar_btn_up" : "scrollbar_btn_left");
_btnForward = new ImageButton("FORWARD", _orientation == Orientation.Vertical ? "scrollbar_btn_down" : "scrollbar_btn_right");
_indicator = new IndicatorButton(_orientation == Orientation.Vertical ? "scrollbar_indicator_vertical" : "scrollbar_indicator_horizontal");
addChild(_btnBack);
addChild(_btnForward);
addChild(_indicator);
_btnBack.onClickListener = &onClick;
_btnForward.onClickListener = &onClick;
}
override void measure(int parentWidth, int parentHeight) {
Point sz;
_btnBack.measure(parentWidth, parentHeight);
_btnForward.measure(parentWidth, parentHeight);
_indicator.measure(parentWidth, parentHeight);
_btnSize = _btnBack.measuredWidth;
_minIndicatorSize = _orientation == Orientation.Vertical ? _indicator.measuredHeight : _indicator.measuredWidth;
if (_btnSize < _btnBack.measuredHeight)
_btnSize = _btnBack.measuredHeight;
if (_btnSize < 16)
@ -207,6 +334,7 @@ class ScrollBar : WidgetGroup {
Rect r;
if (_orientation == Orientation.Vertical) {
// vertical
// buttons
int backbtnpos = rc.top + _btnSize;
int fwdbtnpos = rc.bottom - _btnSize;
r = rc;
@ -215,6 +343,17 @@ class ScrollBar : WidgetGroup {
r = rc;
r.top = fwdbtnpos;
_btnForward.layout(r);
// indicator
r = rc;
r.top = backbtnpos;
r.bottom = fwdbtnpos;
_scrollArea = r;
int spaceBackSize, spaceForwardSize, indicatorSize;
bool indicatorVisible = calcButtonSizes(r.height, spaceBackSize, spaceForwardSize, indicatorSize);
Rect irc = r;
irc.top += spaceBackSize;
irc.bottom -= spaceForwardSize;
_indicator.layout(irc);
} else {
// horizontal
int backbtnpos = rc.left + _btnSize;
@ -225,11 +364,26 @@ class ScrollBar : WidgetGroup {
r = rc;
r.left = fwdbtnpos;
_btnForward.layout(r);
// indicator
r = rc;
r.left = backbtnpos;
r.right = fwdbtnpos;
_scrollArea = r;
int spaceBackSize, spaceForwardSize, indicatorSize;
bool indicatorVisible = calcButtonSizes(r.width, spaceBackSize, spaceForwardSize, indicatorSize);
Rect irc = r;
irc.left += spaceBackSize;
irc.right -= spaceForwardSize;
_indicator.layout(irc);
}
_pos = rc;
_needLayout = false;
}
override bool onClick(Widget source) {
return true;
}
/// Draw widget at its position to buffer
override void onDraw(DrawBuf buf) {
if (visibility != Visibility.Visible)
@ -241,5 +395,6 @@ class ScrollBar : WidgetGroup {
ClipRectSaver(buf, rc);
_btnForward.onDraw(buf);
_btnBack.onDraw(buf);
_indicator.onDraw(buf);
}
}

4
src/dlangui/widgets/widget.d
View File

@ -31,6 +31,10 @@ enum Orientation : ubyte {
Horizontal
}
interface OnClickHandler {
bool onClick(Widget source);
}
class Widget {
/// widget id
protected string _id;