*
* 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"),
/**
* THScroller implements a simple horizontal scroll bar.
*/
-public final class THScroller extends TWidget {
+public class THScroller extends TWidget {
+
+ // ------------------------------------------------------------------------
+ // Variables --------------------------------------------------------------
+ // ------------------------------------------------------------------------
/**
* Value that corresponds to being on the left edge of the scroll bar.
*/
private int leftValue = 0;
- /**
- * Get the value that corresponds to being on the left edge of the scroll
- * bar.
- *
- * @return the scroll value
- */
- public int getLeftValue() {
- return leftValue;
- }
-
- /**
- * Set the value that corresponds to being on the left edge of the
- * scroll bar.
- *
- * @param leftValue the new scroll value
- */
- public void setLeftValue(final int leftValue) {
- this.leftValue = leftValue;
- }
-
/**
* Value that corresponds to being on the right edge of the scroll bar.
*/
private int rightValue = 100;
- /**
- * Get the value that corresponds to being on the right edge of the
- * scroll bar.
- *
- * @return the scroll value
- */
- public int getRightValue() {
- return rightValue;
- }
-
- /**
- * Set the value that corresponds to being on the right edge of the
- * scroll bar.
- *
- * @param rightValue the new scroll value
- */
- public void setRightValue(final int rightValue) {
- this.rightValue = rightValue;
- }
-
/**
* Current value of the scroll.
*/
private int value = 0;
- /**
- * Get current value of the scroll.
- *
- * @return the scroll value
- */
- public int getValue() {
- return value;
- }
-
- /**
- * Set current value of the scroll.
- *
- * @param value the new scroll value
- */
- public void setValue(final int value) {
- this.value = value;
- }
-
/**
* The increment for clicking on an arrow.
*/
private int smallChange = 1;
- /**
- * Set the increment for clicking on an arrow.
- *
- * @param smallChange the new increment value
- */
- public void setSmallChange(final int smallChange) {
- this.smallChange = smallChange;
- }
-
/**
* The increment for clicking in the bar between the box and an arrow.
*/
private int bigChange = 20;
- /**
- * Set the increment for clicking in the bar between the box and an
- * arrow.
- *
- * @param bigChange the new increment value
- */
- public void setBigChange(final int bigChange) {
- this.bigChange = bigChange;
- }
-
/**
* When true, the user is dragging the scroll box.
*/
private boolean inScroll = false;
+ // ------------------------------------------------------------------------
+ // Constructors -----------------------------------------------------------
+ // ------------------------------------------------------------------------
+
/**
* Public constructor.
*
super(parent, x, y, width, 1);
}
- /**
- * Compute the position of the scroll box (a.k.a. grip, thumb).
- *
- * @return Y position of the box, between 1 and width - 2
- */
- private int boxPosition() {
- return (getWidth() - 3) * (value - leftValue) / (rightValue - leftValue) + 1;
- }
-
- /**
- * Draw a horizontal scroll bar.
- */
- @Override
- public void draw() {
- CellAttributes arrowColor = getTheme().getColor("tscroller.arrows");
- CellAttributes barColor = getTheme().getColor("tscroller.bar");
- getScreen().putCharXY(0, 0, GraphicsChars.CP437[0x11], arrowColor);
- getScreen().putCharXY(getWidth() - 1, 0, GraphicsChars.CP437[0x10],
- arrowColor);
-
- // Place the box
- if (rightValue > leftValue) {
- getScreen().hLineXY(1, 0, getWidth() - 2, GraphicsChars.CP437[0xB1],
- barColor);
- getScreen().putCharXY(boxPosition(), 0, GraphicsChars.BOX,
- arrowColor);
- } else {
- getScreen().hLineXY(1, 0, getWidth() - 2, GraphicsChars.HATCH,
- barColor);
- }
-
- }
-
- /**
- * Perform a small step change left.
- */
- public void decrement() {
- if (leftValue == rightValue) {
- return;
- }
- value -= smallChange;
- if (value < leftValue) {
- value = leftValue;
- }
- }
-
- /**
- * Perform a small step change right.
- */
- public void increment() {
- if (leftValue == rightValue) {
- return;
- }
- value += smallChange;
- if (value > rightValue) {
- value = rightValue;
- }
- }
+ // ------------------------------------------------------------------------
+ // Event handlers ---------------------------------------------------------
+ // ------------------------------------------------------------------------
/**
* Handle mouse button releases.
// Recompute value based on new box position
value = (rightValue - leftValue)
* (mouse.getX()) / (getWidth() - 3) + leftValue;
+ if (value > rightValue) {
+ value = rightValue;
+ }
+ if (value < leftValue) {
+ value = leftValue;
+ }
return;
}
inScroll = false;
}
+ // ------------------------------------------------------------------------
+ // TWidget ----------------------------------------------------------------
+ // ------------------------------------------------------------------------
+
+ /**
+ * Draw a horizontal scroll bar.
+ */
+ @Override
+ public void draw() {
+ CellAttributes arrowColor = getTheme().getColor("tscroller.arrows");
+ CellAttributes barColor = getTheme().getColor("tscroller.bar");
+ putCharXY(0, 0, GraphicsChars.CP437[0x11], arrowColor);
+ putCharXY(getWidth() - 1, 0, GraphicsChars.CP437[0x10], arrowColor);
+
+ // Place the box
+ if (rightValue > leftValue) {
+ hLineXY(1, 0, getWidth() - 2, GraphicsChars.CP437[0xB1], barColor);
+ putCharXY(boxPosition(), 0, GraphicsChars.BOX, arrowColor);
+ } else {
+ hLineXY(1, 0, getWidth() - 2, GraphicsChars.HATCH, barColor);
+ }
+
+ }
+
+ // ------------------------------------------------------------------------
+ // THScroller -------------------------------------------------------------
+ // ------------------------------------------------------------------------
+
+ /**
+ * Get the value that corresponds to being on the left edge of the scroll
+ * bar.
+ *
+ * @return the scroll value
+ */
+ public int getLeftValue() {
+ return leftValue;
+ }
+
+ /**
+ * Set the value that corresponds to being on the left edge of the
+ * scroll bar.
+ *
+ * @param leftValue the new scroll value
+ */
+ public void setLeftValue(final int leftValue) {
+ this.leftValue = leftValue;
+ }
+
+ /**
+ * Get the value that corresponds to being on the right edge of the
+ * scroll bar.
+ *
+ * @return the scroll value
+ */
+ public int getRightValue() {
+ return rightValue;
+ }
+
+ /**
+ * Set the value that corresponds to being on the right edge of the
+ * scroll bar.
+ *
+ * @param rightValue the new scroll value
+ */
+ public void setRightValue(final int rightValue) {
+ this.rightValue = rightValue;
+ }
+
+ /**
+ * Get current value of the scroll.
+ *
+ * @return the scroll value
+ */
+ public int getValue() {
+ return value;
+ }
+
+ /**
+ * Set current value of the scroll.
+ *
+ * @param value the new scroll value
+ */
+ public void setValue(final int value) {
+ this.value = value;
+ }
+
+ /**
+ * Get the increment for clicking on an arrow.
+ *
+ * @return the increment value
+ */
+ public int getSmallChange() {
+ return smallChange;
+ }
+
+ /**
+ * Set the increment for clicking on an arrow.
+ *
+ * @param smallChange the new increment value
+ */
+ public void setSmallChange(final int smallChange) {
+ this.smallChange = smallChange;
+ }
+
+ /**
+ * Set the increment for clicking in the bar between the box and an
+ * arrow.
+ *
+ * @return the increment value
+ */
+ public int getBigChange() {
+ return bigChange;
+ }
+
+ /**
+ * Set the increment for clicking in the bar between the box and an
+ * arrow.
+ *
+ * @param bigChange the new increment value
+ */
+ public void setBigChange(final int bigChange) {
+ this.bigChange = bigChange;
+ }
+
+ /**
+ * Compute the position of the scroll box (a.k.a. grip, thumb).
+ *
+ * @return Y position of the box, between 1 and width - 2
+ */
+ private int boxPosition() {
+ return (getWidth() - 3) * (value - leftValue) / (rightValue - leftValue) + 1;
+ }
+
+ /**
+ * Perform a small step change left.
+ */
+ public void decrement() {
+ if (leftValue == rightValue) {
+ return;
+ }
+ value -= smallChange;
+ if (value < leftValue) {
+ value = leftValue;
+ }
+ }
+
+ /**
+ * Perform a small step change right.
+ */
+ public void increment() {
+ if (leftValue == rightValue) {
+ return;
+ }
+ value += smallChange;
+ if (value > rightValue) {
+ value = rightValue;
+ }
+ }
+
+ /**
+ * Perform a big step change left.
+ */
+ public void bigDecrement() {
+ if (leftValue == rightValue) {
+ return;
+ }
+ value -= bigChange;
+ if (value < leftValue) {
+ value = leftValue;
+ }
+ }
+
+ /**
+ * Perform a big step change right.
+ */
+ public void bigIncrement() {
+ if (rightValue == leftValue) {
+ return;
+ }
+ value += bigChange;
+ if (value > rightValue) {
+ value = rightValue;
+ }
+ }
+
+ /**
+ * Go to the left edge of the scroller.
+ */
+ public void toLeft() {
+ value = leftValue;
+ }
+
+ /**
+ * Go to the right edge of the scroller.
+ */
+ public void toRight() {
+ value = rightValue;
+ }
+
}
git://git.nikiroo.be / fanfix.git / blobdiff