Initial commit

Author: Ghostopheles

.gitignore

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+LibStub/

.pkgmeta

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+package-as: LibFleeingButton-1.0
+
+license-output: LICENSE
+
+externals:
+  LibStub: https://repos.wowace.com/wow/libstub/trunk
+
+ignore:
+  - LibStub/*.rockspec
+  - LibStub/*.toc
+  - LibStub/changelog.*
+  - LibStub/CHANGELOG.*
+  - LibStub/docs
+  - LibStub/examples
+  - LibStub/README.*
+  - LibStub/tests
+  - LibStub/.pkgmeta
+  - .gitignore
+  - CHANGELOG.md
+  - README.md
+
+manual-changelog:
+  filename: CHANGELOG.md
+  markup-type: markdown

LibFleeingButton-1.0.lua

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+assert(LibStub, "LibStub not found.");
+
+---@alias LibFleeingButton-1.0 LibFleeingButton
+local major, minor = "LibFleeingButton-1.0", 1;
+
+---@class LibFleeingButton
+local LibFleeingButton = LibStub:NewLibrary(major, minor);
+
+if not LibFleeingButton then
+    return;
+end
+
+local NUM_CURSOR_SAMPLES = 5;
+local FLEEING_BUTTONS = {};
+
+-- stolen from TRP3
+local function Debounce(timeout, callback)
+	local calls = 0;
+
+	local function Decrement()
+		calls = calls - 1;
+
+		if calls == 0 then
+			callback();
+		end
+	end
+
+	return function()
+		C_Timer.After(timeout, Decrement);
+		calls = calls + 1;
+	end
+end
+
+local function ShouldMoveButton(button)
+    if InCombatLockdown() then
+        return false;
+    end
+
+    if not FLEEING_BUTTONS[button] then
+        return false;
+    end
+
+    if FLEEING_BUTTONS[button].Disabled then
+        return false;
+    end
+
+    return true;
+end
+
+local function HandleOnUpdate(button, deltaTime)
+    if not ShouldMoveButton(button) then
+        return;
+    end
+
+    local data = FLEEING_BUTTONS[button];
+    if not data then
+        return;
+    end
+
+    local cursorX, cursorY = GetScaledCursorPosition();
+    data.CursorSamples:PushFront({
+        x = cursorX,
+        y = cursorY,
+    });
+
+    local numSamples = data.CursorSamples:GetNumElements();
+
+    local sumX = 0;
+    local sumY = 0;
+    for _, element in data.CursorSamples:EnumerateIndexedEntries() do
+        sumX = sumX + element.x;
+        sumY = sumY + element.y;
+    end
+    local avgX = sumX / numSamples;
+    local avgY = sumY / numSamples;
+
+    local buttonX, buttonY = button:GetCenter();
+
+    local distX, distY =  buttonX - avgX, buttonY - avgY;
+    local totalDistanceSquared = distX^2 + distY^2;
+    if totalDistanceSquared < 0.1 then
+        totalDistanceSquared = 0.1;
+    end
+
+    local totalDistance = sqrt(totalDistanceSquared);
+
+    local force = 1000000000 / totalDistanceSquared;
+    local offset = force * deltaTime^2;
+    if offset > 10 then
+        offset = 10;
+    end
+
+    if totalDistance > 200 then
+        return;
+    end
+
+    local offsetX = offset * (distX / totalDistance);
+    local offsetY = offset * (distY / totalDistance);
+
+    button:AdjustPointsOffset(offsetX, offsetY);
+end
+
+------------
+
+function LibFleeingButton.MakeButtonFlee(button)
+    if not FLEEING_BUTTONS[button] then
+        button:HookScript("OnUpdate", HandleOnUpdate);
+        button:SetClampedToScreen(true);
+
+        FLEEING_BUTTONS[button] = {
+            CursorSamples = CreateCircularBuffer(NUM_CURSOR_SAMPLES),
+            Disabled = false,
+        };
+    end
+end
+
+function LibFleeingButton.PauseButtonFleeing(button)
+    if FLEEING_BUTTONS[button] then
+        FLEEING_BUTTONS[button].Disabled = true;
+    end
+end
+
+function LibFleeingButton.ResumeButtonFleeing(button)
+    if FLEEING_BUTTONS[button] then
+        FLEEING_BUTTONS[button].Disabled = false;
+    end
+end
+
+function LibFleeingButton.ResetButton(button)
+    FLEEING_BUTTONS[button] = nil;
+    button:ClearPointsOffset();
+end

LibFleeingButton-1.0.toc

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+## Interface: 110000
+## Title: Lib: LibFleeingButton
+## Notes: A cadaverous tool for creating buttons that flee from the cursor.
+## Author: Ghostopheles
+## Version: @project-version@
+## IconAtlas: minortalents-icon-book
+
+## OptionalDeps: LibStub
+
+## X-License: Public Domain
+## X-Category: Library
+
+LibStub/LibStub.lua
+LibFleeingButton-1.0.lua