mirror of https://github.com/buggins/dlangui.git
add SliderWidget - implement #300
This commit is contained in:
Vadim Lopatin
parent
ab74d39405
commit
c5e2636157
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@ -330,7 +330,7 @@ void registerStandardWidgets() {
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mixin(registerWidgets!(FileNameEditLine, DirEditLine, //dlangui.dialogs.filedlg
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ComboBox, ComboEdit, //dlangui.widgets.combobox
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Widget, TextWidget, MultilineTextWidget, Button, ImageWidget, ImageButton, ImageCheckButton, ImageTextButton,
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SwitchButton, RadioButton, CheckBox, ScrollBar, HSpacer, VSpacer, CanvasWidget, // dlangui.widgets.controls
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SwitchButton, RadioButton, CheckBox, ScrollBar, SliderWidget, HSpacer, VSpacer, CanvasWidget, // dlangui.widgets.controls
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EditLine, EditBox, LogWidget,//dlangui.widgets.editors
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StringGridWidget, //dlangui.widgets.grid
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VerticalLayout, HorizontalLayout, TableLayout, FrameLayout, // dlangui.widgets.layouts
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@ -15,8 +15,12 @@ ImageTextButton - button with text and image
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ScrollBar - scrollbar control
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SliderWidget - slider control
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UrlImageTextButton - URL link button
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CanvasWidget - for drawing arbitrary graphics
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Synopsis:
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----
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@ -1119,6 +1123,393 @@ class ScrollBar : AbstractSlider, OnClickHandler {
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}
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}
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/// scroll bar - either vertical or horizontal
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class SliderWidget : AbstractSlider, OnClickHandler {
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protected SliderButton _indicator;
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protected PageScrollButton _pageUp;
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protected PageScrollButton _pageDown;
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protected Rect _scrollArea;
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protected int _btnSize;
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protected int _minIndicatorSize;
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class PageScrollButton : Widget {
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this(string ID) {
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super(ID);
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styleId = STYLE_PAGE_SCROLL;
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trackHover = true;
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clickable = true;
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}
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}
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class SliderButton : ImageButton {
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Point _dragStart;
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int _dragStartPosition;
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bool _dragging;
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Rect _dragStartRect;
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this(string resourceId) {
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super("SLIDER", resourceId);
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styleId = STYLE_SCROLLBAR_BUTTON;
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trackHover = true;
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}
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/// process mouse event; return true if event is processed by widget.
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override bool onMouseEvent(MouseEvent event) {
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// support onClick
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if (event.action == MouseAction.ButtonDown && event.button == MouseButton.Left) {
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setState(State.Pressed);
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_dragging = true;
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_dragStart.x = event.x;
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_dragStart.y = event.y;
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_dragStartPosition = _position;
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_dragStartRect = _pos;
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sendScrollEvent(ScrollAction.SliderPressed, _position);
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return true;
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}
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if (event.action == MouseAction.FocusOut && _dragging) {
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debug(scrollbar) Log.d("ScrollBar slider dragging - FocusOut");
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return true;
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}
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if (event.action == MouseAction.FocusIn && _dragging) {
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debug(scrollbar) Log.d("ScrollBar slider dragging - FocusIn");
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return true;
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}
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if (event.action == MouseAction.Move && _dragging) {
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int delta = _orientation == Orientation.Vertical ? event.y - _dragStart.y : event.x - _dragStart.x;
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debug(scrollbar) Log.d("ScrollBar slider dragging - Move delta=", delta);
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Rect rc = _dragStartRect;
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int offset;
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int space;
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if (_orientation == Orientation.Vertical) {
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rc.top += delta;
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rc.bottom += delta;
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if (rc.top < _scrollArea.top) {
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rc.top = _scrollArea.top;
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rc.bottom = _scrollArea.top + _dragStartRect.height;
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} else if (rc.bottom > _scrollArea.bottom) {
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rc.top = _scrollArea.bottom - _dragStartRect.height;
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rc.bottom = _scrollArea.bottom;
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}
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offset = rc.top - _scrollArea.top;
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space = _scrollArea.height - rc.height;
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} else {
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rc.left += delta;
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rc.right += delta;
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if (rc.left < _scrollArea.left) {
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rc.left = _scrollArea.left;
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rc.right = _scrollArea.left + _dragStartRect.width;
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} else if (rc.right > _scrollArea.right) {
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rc.left = _scrollArea.right - _dragStartRect.width;
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rc.right = _scrollArea.right;
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}
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offset = rc.left - _scrollArea.left;
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space = _scrollArea.width - rc.width;
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}
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layoutButtons(rc);
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//_pos = rc;
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int position = cast(int)(space > 0 ? _minValue + cast(long)offset * (_maxValue - _minValue - _pageSize) / space : 0);
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invalidate();
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onIndicatorDragging(_dragStartPosition, position);
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return true;
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}
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if (event.action == MouseAction.ButtonUp && event.button == MouseButton.Left) {
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resetState(State.Pressed);
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if (_dragging) {
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sendScrollEvent(ScrollAction.SliderReleased, _position);
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_dragging = false;
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}
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return true;
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}
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if (event.action == MouseAction.Move && trackHover) {
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if (!(state & State.Hovered)) {
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debug(scrollbar) Log.d("Hover ", id);
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setState(State.Hovered);
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}
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return true;
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}
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if (event.action == MouseAction.Leave && trackHover) {
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debug(scrollbar) Log.d("Leave ", id);
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resetState(State.Hovered);
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return true;
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}
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if (event.action == MouseAction.Cancel && trackHover) {
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debug(scrollbar) Log.d("Cancel ? trackHover", id);
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resetState(State.Hovered);
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resetState(State.Pressed);
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_dragging = false;
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return true;
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}
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if (event.action == MouseAction.Cancel) {
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debug(scrollbar) Log.d("SliderButton.onMouseEvent event.action == MouseAction.Cancel");
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resetState(State.Pressed);
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_dragging = false;
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return true;
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}
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return false;
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}
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}
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protected bool onIndicatorDragging(int initialPosition, int currentPosition) {
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_position = currentPosition;
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return sendScrollEvent(ScrollAction.SliderMoved, currentPosition);
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}
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private bool calcButtonSizes(int availableSize, ref int spaceBackSize, ref int spaceForwardSize, ref int indicatorSize) {
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int dv = _maxValue - _minValue;
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if (_pageSize >= dv) {
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// full size
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spaceBackSize = spaceForwardSize = 0;
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indicatorSize = availableSize;
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return false;
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}
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if (dv < 0)
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dv = 0;
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indicatorSize = dv ? _pageSize * availableSize / dv : _minIndicatorSize;
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if (indicatorSize < _minIndicatorSize)
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indicatorSize = _minIndicatorSize;
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if (indicatorSize >= availableSize) {
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// full size
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spaceBackSize = spaceForwardSize = 0;
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indicatorSize = availableSize;
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return false;
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}
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int spaceLeft = availableSize - indicatorSize;
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int topv = _position - _minValue;
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int bottomv = _position + _pageSize - _minValue;
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if (topv < 0)
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topv = 0;
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if (bottomv > dv)
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bottomv = dv;
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bottomv = dv - bottomv;
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spaceBackSize = cast(int)(cast(long)spaceLeft * topv / (topv + bottomv));
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spaceForwardSize = spaceLeft - spaceBackSize;
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return true;
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}
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/// returns scrollbar orientation (Vertical, Horizontal)
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override @property Orientation orientation() { return _orientation; }
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/// sets scrollbar orientation
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override @property AbstractSlider orientation(Orientation value) {
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if (_orientation != value) {
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_orientation = value;
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_indicator.drawableId = style.customDrawableId(_orientation == Orientation.Vertical ? ATTR_SCROLLBAR_INDICATOR_VERTICAL : ATTR_SCROLLBAR_INDICATOR_HORIZONTAL);
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requestLayout();
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}
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return this;
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}
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/// set string property value, for ML loaders
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override bool setStringProperty(string name, string value) {
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if (name.equal("orientation")) {
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if (value.equal("Vertical") || value.equal("vertical"))
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orientation = Orientation.Vertical;
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else
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orientation = Orientation.Horizontal;
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return true;
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}
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return super.setStringProperty(name, value);
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}
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/// empty parameter list constructor - for usage by factory
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this() {
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this(null, Orientation.Horizontal);
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}
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/// create with ID parameter
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this(string ID, Orientation orient = Orientation.Horizontal) {
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super(ID);
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styleId = STYLE_SCROLLBAR;
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_orientation = orient;
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_pageUp = new PageScrollButton("PAGE_UP");
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_pageDown = new PageScrollButton("PAGE_DOWN");
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_indicator = new SliderButton(style.customDrawableId(_orientation == Orientation.Vertical ? ATTR_SCROLLBAR_INDICATOR_VERTICAL : ATTR_SCROLLBAR_INDICATOR_HORIZONTAL));
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addChild(_indicator);
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addChild(_pageUp);
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addChild(_pageDown);
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_indicator.focusable = false;
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_pageUp.focusable = false;
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_pageDown.focusable = false;
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_pageUp.click = &onClick;
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_pageDown.click = &onClick;
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}
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override void measure(int parentWidth, int parentHeight) {
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Point sz;
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_indicator.measure(parentWidth, parentHeight);
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_pageUp.measure(parentWidth, parentHeight);
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_pageDown.measure(parentWidth, parentHeight);
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_minIndicatorSize = _orientation == Orientation.Vertical ? _indicator.measuredHeight : _indicator.measuredWidth;
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_btnSize = _minIndicatorSize;
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if (_btnSize < _minIndicatorSize)
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_btnSize = _minIndicatorSize;
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static if (BACKEND_GUI) {
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if (_btnSize < 16)
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_btnSize = 16;
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}
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if (_orientation == Orientation.Vertical) {
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// vertical
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sz.x = _btnSize;
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sz.y = _btnSize * 5; // min height
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} else {
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// horizontal
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sz.y = _btnSize;
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sz.x = _btnSize * 5; // min height
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}
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measuredContent(parentWidth, parentHeight, sz.x, sz.y);
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}
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override protected void onPositionChanged() {
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if (!needLayout)
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layoutButtons();
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}
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/// hide controls when scroll is not possible
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protected void updateState() {
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bool canScroll = _maxValue - _minValue > _pageSize;
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if (canScroll) {
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_indicator.visibility = Visibility.Visible;
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_pageUp.visibility = Visibility.Visible;
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_pageDown.visibility = Visibility.Visible;
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} else {
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_indicator.visibility = Visibility.Gone;
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_pageUp.visibility = Visibility.Gone;
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_pageDown.visibility = Visibility.Gone;
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}
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cancelLayout();
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}
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override void cancelLayout() {
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_indicator.cancelLayout();
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_pageUp.cancelLayout();
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_pageDown.cancelLayout();
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super.cancelLayout();
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}
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protected void layoutButtons() {
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Rect irc = _scrollArea;
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if (_orientation == Orientation.Vertical) {
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// vertical
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int spaceBackSize, spaceForwardSize, indicatorSize;
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bool indicatorVisible = calcButtonSizes(_scrollArea.height, spaceBackSize, spaceForwardSize, indicatorSize);
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irc.top += spaceBackSize;
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irc.bottom -= spaceForwardSize;
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layoutButtons(irc);
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} else {
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// horizontal
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int spaceBackSize, spaceForwardSize, indicatorSize;
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bool indicatorVisible = calcButtonSizes(_scrollArea.width, spaceBackSize, spaceForwardSize, indicatorSize);
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irc.left += spaceBackSize;
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irc.right -= spaceForwardSize;
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layoutButtons(irc);
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}
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updateState();
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cancelLayout();
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}
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protected void layoutButtons(Rect irc) {
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Rect r;
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_indicator.visibility = Visibility.Visible;
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if (_orientation == Orientation.Vertical) {
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_indicator.layout(irc);
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if (_scrollArea.top < irc.top) {
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r = _scrollArea;
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r.bottom = irc.top;
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_pageUp.layout(r);
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_pageUp.visibility = Visibility.Visible;
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} else {
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_pageUp.visibility = Visibility.Invisible;
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}
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if (_scrollArea.bottom > irc.bottom) {
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r = _scrollArea;
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r.top = irc.bottom;
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_pageDown.layout(r);
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_pageDown.visibility = Visibility.Visible;
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} else {
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_pageDown.visibility = Visibility.Invisible;
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}
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} else {
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_indicator.layout(irc);
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if (_scrollArea.left < irc.left) {
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r = _scrollArea;
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r.right = irc.left;
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_pageUp.layout(r);
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_pageUp.visibility = Visibility.Visible;
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} else {
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_pageUp.visibility = Visibility.Invisible;
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}
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if (_scrollArea.right > irc.right) {
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r = _scrollArea;
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r.left = irc.right;
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_pageDown.layout(r);
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_pageDown.visibility = Visibility.Visible;
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} else {
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_pageDown.visibility = Visibility.Invisible;
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}
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}
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}
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override void layout(Rect rc) {
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_needLayout = false;
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applyMargins(rc);
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applyPadding(rc);
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Rect r;
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if (_orientation == Orientation.Vertical) {
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// vertical
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// buttons
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// indicator
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r = rc;
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_scrollArea = r;
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} else {
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// horizontal
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// indicator
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r = rc;
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_scrollArea = r;
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}
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layoutButtons();
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_pos = rc;
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}
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override bool onClick(Widget source) {
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Log.d("Scrollbar.onClick ", source.id);
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if (source.compareId("PAGE_UP"))
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return sendScrollEvent(ScrollAction.PageUp, position);
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if (source.compareId("PAGE_DOWN"))
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return sendScrollEvent(ScrollAction.PageDown, position);
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return true;
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}
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/// handle mouse wheel events
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override bool onMouseEvent(MouseEvent event) {
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if (visibility != Visibility.Visible)
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return false;
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if (event.action == MouseAction.Wheel) {
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int delta = event.wheelDelta;
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if (delta > 0)
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sendScrollEvent(ScrollAction.LineUp, position);
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else if (delta < 0)
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sendScrollEvent(ScrollAction.LineDown, position);
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return true;
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}
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return super.onMouseEvent(event);
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}
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/// Draw widget at its position to buffer
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override void onDraw(DrawBuf buf) {
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if (visibility != Visibility.Visible && !buf.isClippedOut(_pos))
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return;
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super.onDraw(buf);
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Rect rc = _pos;
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applyMargins(rc);
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applyPadding(rc);
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auto saver = ClipRectSaver(buf, rc, alpha);
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_pageUp.onDraw(buf);
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_pageDown.onDraw(buf);
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_indicator.onDraw(buf);
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}
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}
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/// interface - slot for onClick
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interface OnDrawHandler {
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void doDraw(CanvasWidget canvas, DrawBuf buf, Rect rc);
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