*
* The MIT License (MIT)
*
- * Copyright (C) 2017 Kevin Lamonte
+ * Copyright (C) 2019 Kevin Lamonte
*
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and associated documentation files (the "Software"),
/**
* TVScroller implements a simple vertical scroll bar.
*/
-public final class TVScroller extends TWidget {
+public class TVScroller extends TWidget {
+
+ // ------------------------------------------------------------------------
+ // Variables --------------------------------------------------------------
+ // ------------------------------------------------------------------------
/**
* Value that corresponds to being on the top edge of the scroll bar.
*/
private int topValue = 0;
+ /**
+ * Value that corresponds to being on the bottom edge of the scroll bar.
+ */
+ private int bottomValue = 100;
+
+ /**
+ * Current value of the scroll.
+ */
+ private int value = 0;
+
+ /**
+ * The increment for clicking on an arrow.
+ */
+ private int smallChange = 1;
+
+ /**
+ * The increment for clicking in the bar between the box and an arrow.
+ */
+ private int bigChange = 20;
+
+ /**
+ * When true, the user is dragging the scroll box.
+ */
+ private boolean inScroll = false;
+
+ // ------------------------------------------------------------------------
+ // Constructors -----------------------------------------------------------
+ // ------------------------------------------------------------------------
+
+ /**
+ * Public constructor.
+ *
+ * @param parent parent widget
+ * @param x column relative to parent
+ * @param y row relative to parent
+ * @param height height of scroll bar
+ */
+ public TVScroller(final TWidget parent, final int x, final int y,
+ final int height) {
+
+ // Set parent and window
+ super(parent, x, y, 1, height);
+ }
+
+ // ------------------------------------------------------------------------
+ // Event handlers ---------------------------------------------------------
+ // ------------------------------------------------------------------------
+
+ /**
+ * Handle mouse button releases.
+ *
+ * @param mouse mouse button release event
+ */
+ @Override
+ public void onMouseUp(final TMouseEvent mouse) {
+ if (bottomValue == topValue) {
+ return;
+ }
+
+ if (inScroll) {
+ inScroll = false;
+ return;
+ }
+
+ if ((mouse.getX() == 0)
+ && (mouse.getY() == 0)
+ ) {
+ // Clicked on the top arrow
+ decrement();
+ return;
+ }
+
+ if ((mouse.getX() == 0)
+ && (mouse.getY() == getHeight() - 1)
+ ) {
+ // Clicked on the bottom arrow
+ increment();
+ return;
+ }
+
+ if ((mouse.getX() == 0)
+ && (mouse.getY() > 0)
+ && (mouse.getY() < boxPosition())
+ ) {
+ // Clicked between the top arrow and the box
+ value -= bigChange;
+ if (value < topValue) {
+ value = topValue;
+ }
+ return;
+ }
+
+ if ((mouse.getX() == 0)
+ && (mouse.getY() > boxPosition())
+ && (mouse.getY() < getHeight() - 1)
+ ) {
+ // Clicked between the box and the bottom arrow
+ value += bigChange;
+ if (value > bottomValue) {
+ value = bottomValue;
+ }
+ return;
+ }
+ }
+
+ /**
+ * Handle mouse movement events.
+ *
+ * @param mouse mouse motion event
+ */
+ @Override
+ public void onMouseMotion(final TMouseEvent mouse) {
+ if (bottomValue == topValue) {
+ return;
+ }
+
+ if ((mouse.isMouse1())
+ && (inScroll)
+ && (mouse.getY() > 0)
+ && (mouse.getY() < getHeight() - 1)
+ ) {
+ // Recompute value based on new box position
+ value = (bottomValue - topValue)
+ * (mouse.getY()) / (getHeight() - 3) + topValue;
+ if (value > bottomValue) {
+ value = bottomValue;
+ }
+ if (value < topValue) {
+ value = topValue;
+ }
+ return;
+ }
+
+ inScroll = false;
+ }
+
+ /**
+ * Handle mouse press events.
+ *
+ * @param mouse mouse button press event
+ */
+ @Override
+ public void onMouseDown(final TMouseEvent mouse) {
+ if (bottomValue == topValue) {
+ return;
+ }
+
+ if ((mouse.getX() == 0)
+ && (mouse.getY() == boxPosition())
+ ) {
+ inScroll = true;
+ return;
+ }
+ }
+
+ // ------------------------------------------------------------------------
+ // TWidget ----------------------------------------------------------------
+ // ------------------------------------------------------------------------
+
+ /**
+ * Draw a vertical scroll bar.
+ */
+ @Override
+ public void draw() {
+ CellAttributes arrowColor = getTheme().getColor("tscroller.arrows");
+ CellAttributes barColor = getTheme().getColor("tscroller.bar");
+ putCharXY(0, 0, GraphicsChars.CP437[0x1E], arrowColor);
+ putCharXY(0, getHeight() - 1, GraphicsChars.CP437[0x1F], arrowColor);
+
+ // Place the box
+ if (bottomValue > topValue) {
+ vLineXY(0, 1, getHeight() - 2, GraphicsChars.CP437[0xB1], barColor);
+ putCharXY(0, boxPosition(), GraphicsChars.BOX, arrowColor);
+ } else {
+ vLineXY(0, 1, getHeight() - 2, GraphicsChars.HATCH, barColor);
+ }
+ }
+
+ // ------------------------------------------------------------------------
+ // TVScroller -------------------------------------------------------------
+ // ------------------------------------------------------------------------
+
/**
* Get the value that corresponds to being on the top edge of the scroll
* bar.
this.topValue = topValue;
}
- /**
- * Value that corresponds to being on the bottom edge of the scroll bar.
- */
- private int bottomValue = 100;
-
/**
* Get the value that corresponds to being on the bottom edge of the
* scroll bar.
this.bottomValue = bottomValue;
}
- /**
- * Current value of the scroll.
- */
- private int value = 0;
-
/**
* Get current value of the scroll.
*
}
/**
- * The increment for clicking on an arrow.
+ * Get the increment for clicking on an arrow.
+ *
+ * @return the increment value
*/
- private int smallChange = 1;
+ public int getSmallChange() {
+ return smallChange;
+ }
/**
* Set the increment for clicking on an arrow.
}
/**
- * The increment for clicking in the bar between the box and an arrow.
+ * Set the increment for clicking in the bar between the box and an
+ * arrow.
+ *
+ * @return the increment value
*/
- private int bigChange = 20;
+ public int getBigChange() {
+ return bigChange;
+ }
/**
* Set the increment for clicking in the bar between the box and an
this.bigChange = bigChange;
}
- /**
- * When true, the user is dragging the scroll box.
- */
- private boolean inScroll = false;
-
- /**
- * Public constructor.
- *
- * @param parent parent widget
- * @param x column relative to parent
- * @param y row relative to parent
- * @param height height of scroll bar
- */
- public TVScroller(final TWidget parent, final int x, final int y,
- final int height) {
-
- // Set parent and window
- super(parent, x, y, 1, height);
- }
-
/**
* Compute the position of the scroll box (a.k.a. grip, thumb).
*
return (getHeight() - 3) * (value - topValue) / (bottomValue - topValue) + 1;
}
- /**
- * Draw a vertical scroll bar.
- */
- @Override
- public void draw() {
- CellAttributes arrowColor = getTheme().getColor("tscroller.arrows");
- CellAttributes barColor = getTheme().getColor("tscroller.bar");
- getScreen().putCharXY(0, 0, GraphicsChars.CP437[0x1E], arrowColor);
- getScreen().putCharXY(0, getHeight() - 1, GraphicsChars.CP437[0x1F],
- arrowColor);
-
- // Place the box
- if (bottomValue > topValue) {
- getScreen().vLineXY(0, 1, getHeight() - 2,
- GraphicsChars.CP437[0xB1], barColor);
- getScreen().putCharXY(0, boxPosition(), GraphicsChars.BOX,
- arrowColor);
- } else {
- getScreen().vLineXY(0, 1, getHeight() - 2, GraphicsChars.HATCH,
- barColor);
- }
-
- }
-
/**
* Perform a small step change up.
*/
value = bottomValue;
}
- /**
- * Handle mouse button releases.
- *
- * @param mouse mouse button release event
- */
- @Override
- public void onMouseUp(final TMouseEvent mouse) {
- if (bottomValue == topValue) {
- return;
- }
-
- if (inScroll) {
- inScroll = false;
- return;
- }
-
- if ((mouse.getX() == 0)
- && (mouse.getY() == 0)
- ) {
- // Clicked on the top arrow
- decrement();
- return;
- }
-
- if ((mouse.getX() == 0)
- && (mouse.getY() == getHeight() - 1)
- ) {
- // Clicked on the bottom arrow
- increment();
- return;
- }
-
- if ((mouse.getX() == 0)
- && (mouse.getY() > 0)
- && (mouse.getY() < boxPosition())
- ) {
- // Clicked between the top arrow and the box
- value -= bigChange;
- if (value < topValue) {
- value = topValue;
- }
- return;
- }
-
- if ((mouse.getX() == 0)
- && (mouse.getY() > boxPosition())
- && (mouse.getY() < getHeight() - 1)
- ) {
- // Clicked between the box and the bottom arrow
- value += bigChange;
- if (value > bottomValue) {
- value = bottomValue;
- }
- return;
- }
- }
-
- /**
- * Handle mouse movement events.
- *
- * @param mouse mouse motion event
- */
- @Override
- public void onMouseMotion(final TMouseEvent mouse) {
- if (bottomValue == topValue) {
- return;
- }
-
- if ((mouse.isMouse1())
- && (inScroll)
- && (mouse.getY() > 0)
- && (mouse.getY() < getHeight() - 1)
- ) {
- // Recompute value based on new box position
- value = (bottomValue - topValue)
- * (mouse.getY()) / (getHeight() - 3) + topValue;
- return;
- }
-
- inScroll = false;
- }
-
- /**
- * Handle mouse press events.
- *
- * @param mouse mouse button press event
- */
- @Override
- public void onMouseDown(final TMouseEvent mouse) {
- if (bottomValue == topValue) {
- return;
- }
-
- if ((mouse.getX() == 0)
- && (mouse.getY() == boxPosition())
- ) {
- inScroll = true;
- return;
- }
- }
-
}
git://git.nikiroo.be / fanfix.git / blobdiff