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Removed the handle field from Region
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This commit removes the public handle field from Region for win32 since
it is now replaced by win32_getHandle method for the clients and
internally the class uses a hashMap zoomToHandle to get the handle for
the particular zoomlevel. The default handle is stored in zoomToHandle
mapped to the initialZoom.

contributes #62 and #127
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@amartya4256
amartya4256 committed Jun 27, 2024
1 parent 4ce5919 commit e2bd8c1
Showing 1 changed file with 22 additions and 34 deletions.
56 changes: 22 additions & 34 deletions bundles/org.eclipse.swt/Eclipse SWT/win32/org/eclipse/swt/graphics/Region.java
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Original file line number Diff line number Diff line change
Expand Up @@ -36,20 +36,6 @@
*/
public final class Region extends Resource {

/**
* the OS resource for the region
* (Warning: This field is platform dependent)
* <p>
* <b>IMPORTANT:</b> This field is <em>not</em> part of the SWT
* public API. It is marked public only so that it can be shared
* within the packages provided by SWT. It is not available on all
* platforms and should never be accessed from application code.
* </p>
*
* @noreference This field is not intended to be referenced by clients.
*/
public long handle;

private int initialZoom;

private HashMap<Integer, Long> zoomToHandle = new HashMap<>();
Expand Down Expand Up @@ -94,7 +80,7 @@ public Region () {
public Region (Device device) {
super(device);
initialZoom = DPIUtil.getDeviceZoom();
handle = OS.CreateRectRgn (0, 0, 0, 0);
long handle = OS.CreateRectRgn (0, 0, 0, 0);
zoomToHandle.put(initialZoom, handle);
if (handle == 0) SWT.error(SWT.ERROR_NO_HANDLES);
init();
Expand Down Expand Up @@ -123,7 +109,7 @@ public void add (int[] pointArray) {
}

void addInPixels (int[] pointArray) {
addInPixels(handle, pointArray);
addInPixels(win32_getHandle(this, initialZoom), pointArray);
}

private void addInPixels (long handle, int[] pointArray) {
Expand Down Expand Up @@ -179,7 +165,7 @@ public void add (int x, int y, int width, int height) {
}

void addInPixels (int x, int y, int width, int height) {
addInPixels(handle, x, y, width, height);
addInPixels(win32_getHandle(this, initialZoom), x, y, width, height);
}

private void addInPixels (long handle, int x, int y, int width, int height) {
Expand Down Expand Up @@ -209,7 +195,8 @@ public void add (Region region) {
if (region == null) SWT.error(SWT.ERROR_NULL_ARGUMENT);
if (region.isDisposed()) SWT.error(SWT.ERROR_INVALID_ARGUMENT);
operations.add(new Operation(OperationType.ADD, ArgumentType.REGION, region));
OS.CombineRgn (handle, handle, region.handle, OS.RGN_OR);
long handle = win32_getHandle(this, initialZoom);
OS.CombineRgn (handle, handle, win32_getHandle(region, initialZoom), OS.RGN_OR);
}

/**
Expand All @@ -231,7 +218,7 @@ public boolean contains (int x, int y) {
}

boolean containsInPixels (int x, int y) {
return OS.PtInRegion (handle, x, y);
return OS.PtInRegion (win32_getHandle(this, initialZoom), x, y);
}

/**
Expand Down Expand Up @@ -259,8 +246,7 @@ public boolean contains (Point pt) {
@Override
void destroy () {
zoomToHandle.values().forEach(handle -> OS.DeleteObject(handle));
OS.DeleteObject(handle);
handle = 0;
zoomToHandle.clear();
operations.clear();
}

Expand All @@ -279,7 +265,7 @@ public boolean equals (Object object) {
if (this == object) return true;
if (!(object instanceof Region)) return false;
Region rgn = (Region)object;
return handle == rgn.handle;
return win32_getHandle(this, initialZoom) == win32_getHandle(rgn, initialZoom);
}

/**
Expand All @@ -302,7 +288,7 @@ public Rectangle getBounds () {

Rectangle getBoundsInPixels() {
RECT rect = new RECT();
OS.GetRgnBox(handle, rect);
OS.GetRgnBox(win32_getHandle(this, initialZoom), rect);
return new Rectangle(rect.left, rect.top, rect.right - rect.left, rect.bottom - rect.top);
}

Expand All @@ -318,7 +304,7 @@ Rectangle getBoundsInPixels() {
*/
@Override
public int hashCode () {
return (int)handle;
return (int)win32_getHandle(this, initialZoom);
}

/**
Expand Down Expand Up @@ -370,7 +356,7 @@ public void intersect (int x, int y, int width, int height) {
}

void intersectInPixels (int x, int y, int width, int height) {
intersectInPixels(handle, x, y, width, height);
intersectInPixels(win32_getHandle(this, initialZoom), x, y, width, height);
}

private void intersectInPixels (long handle, int x, int y, int width, int height) {
Expand Down Expand Up @@ -401,7 +387,8 @@ public void intersect (Region region) {
if (isDisposed()) SWT.error(SWT.ERROR_GRAPHIC_DISPOSED);
if (region == null) SWT.error(SWT.ERROR_NULL_ARGUMENT);
if (region.isDisposed()) SWT.error(SWT.ERROR_INVALID_ARGUMENT);
OS.CombineRgn (handle, handle, region.handle, OS.RGN_AND);
long handle = win32_getHandle(this, initialZoom);
OS.CombineRgn (handle, handle, win32_getHandle(region, initialZoom), OS.RGN_AND);
}

/**
Expand Down Expand Up @@ -429,7 +416,7 @@ public boolean intersects (int x, int y, int width, int height) {
boolean intersectsInPixels (int x, int y, int width, int height) {
RECT r = new RECT ();
OS.SetRect (r, x, y, x + width, y + height);
return OS.RectInRegion (handle, r);
return OS.RectInRegion (win32_getHandle(this, initialZoom), r);
}

/**
Expand Down Expand Up @@ -468,7 +455,7 @@ public boolean intersects (Rectangle rect) {
*/
@Override
public boolean isDisposed() {
return handle == 0;
return zoomToHandle.isEmpty();
}

/**
Expand All @@ -485,7 +472,7 @@ public boolean isDisposed() {
public boolean isEmpty () {
if (isDisposed()) SWT.error(SWT.ERROR_GRAPHIC_DISPOSED);
RECT rect = new RECT ();
int result = OS.GetRgnBox (handle, rect);
int result = OS.GetRgnBox (win32_getHandle(this, initialZoom), rect);
if (result == OS.NULLREGION) return true;
return ((rect.right - rect.left) <= 0) || ((rect.bottom - rect.top) <= 0);
}
Expand Down Expand Up @@ -513,7 +500,7 @@ public void subtract (int[] pointArray) {
}

void subtractInPixels (int[] pointArray) {
subtractInPixels(handle, pointArray);
subtractInPixels(win32_getHandle(this, initialZoom), pointArray);
}

private void subtractInPixels (long handle, int[] pointArray) {
Expand Down Expand Up @@ -571,7 +558,7 @@ public void subtract (int x, int y, int width, int height) {
}

void subtractInPixels (int x, int y, int width, int height) {
subtractInPixels(handle, x, y, width, height);
subtractInPixels(win32_getHandle(this, initialZoom), x, y, width, height);
}

private void subtractInPixels (long handle, int x, int y, int width, int height) {
Expand Down Expand Up @@ -602,7 +589,8 @@ public void subtract (Region region) {
if (isDisposed()) SWT.error(SWT.ERROR_GRAPHIC_DISPOSED);
if (region == null) SWT.error(SWT.ERROR_NULL_ARGUMENT);
if (region.isDisposed()) SWT.error(SWT.ERROR_INVALID_ARGUMENT);
OS.CombineRgn (handle, handle, region.handle, OS.RGN_DIFF);
long handle = win32_getHandle(this, initialZoom);
OS.CombineRgn (handle, handle, win32_getHandle(region, initialZoom), OS.RGN_DIFF);
}

/**
Expand All @@ -625,7 +613,7 @@ public void translate (int x, int y) {
}

void translateInPixels (int x, int y) {
OS.OffsetRgn (handle, x, y);
OS.OffsetRgn (win32_getHandle(this, initialZoom), x, y);
}

/**
Expand Down Expand Up @@ -688,7 +676,7 @@ public static long win32_getHandle(Region region, int zoom) {
@Override
public String toString () {
if (isDisposed()) return "Region {*DISPOSED*}";
return "Region {" + handle + "}";
return "Region " + zoomToHandle;
}

class Operation {
Expand Down

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