78e7ae5145
DearMQL5 is an institutional-grade, immediate-mode graphical user interface
(GUI) engine designed from the ground up for MetaTrader 5 (MQL5), inspired by
the ergonomics and performance of Dear ImGui.
### Core Architecture & Execution Pipeline
- Immediate-Mode Paradigm: Declarative frame-based rendering pipeline with zero
memory allocation churn during render loops and deterministic execution.
- Modular Per-Hub Canvas Surfaces (CUWindowSurface): Replaces full-screen canvas
overlays with isolated, window-bounded CCanvas bitmaps, reducing memory usage
by up to 93% (~570 KB vs 8.3 MB for 1080p) and preventing click-swallowing.
- 0-Cost Hardware Texture Drag Engine: Absolute-anchor drag mechanics update
native MT5 OBJPROP_XDISTANCE and OBJPROP_YDISTANCE properties directly on
the compositor, bypassing CPU rasterization completely (0.00% CPU usage).
- Chart Scroll Protection: Automatically suppresses chart history sliding
(CHART_MOUSE_SCROLL) during active HUD dragging and safely restores it on release.
- Two-Phase Hit-Testing: Interactive controls (buttons, sliders, toggles) receive
first-priority click focus, cleanly separating widget actions from window drags.
### Subsystems & Components
- Core State & Input (Core/):
* UInputState: Mouse/keyboard tracking, deltas, and chart scroll lock.
* UState: Retained state hash map in pure MQL5 with 64-bit FNV-1a hashing.
* UIdStack: Hierarchical identifier scoping preventing widget ID collisions.
* ULayout: Automatic cursor placement supporting SameLine, Indent, and Unindent.
* UEventQueue: Non-blocking circular UI event queue for decoupled handling.
* UTheme: Institutional OneDark/Nord dark color palette and typography metrics.
- Rendering Backends (Render/):
* URendererCanvas: Isolated per-hub surfaces with 32-bit ARGB alpha transparency.
* URendererNative: Native MT5 object pool (OBJ_RECTANGLE_LABEL) with diff caching.
* UFont: Anti-aliased font metrics and width cache.
- Complete Widget Suite (Widgets/):
* UButton: Click-on-release standard, accent, and emergency panic buttons.
* UToggle: Smooth draggable/clickable iOS-style toggle switches.
* USlider: Draggable horizontal float and integer sliders.
* UProgressBar: Adaptive progress bars with dynamic green->amber->red color ramps.
* UHeader: Collapsible section headers with immediate-mode state retention.
* ULabel & USeparator: Formatted text, colored metrics, and horizontal dividers.
- Window Management (Windows/):
* UWindow: Window container with titlebar, collapse toggle, and coordinate clipping.
* UWindowManager: Multi-window coordinator with GlobalVariable persistence across
chart timeframe changes and backward-compatible key resolution.
### Tooling, Documentation & Reference Implementation
- Examples/EA_DearMQL5_Demo.mq5: Complete reference Prop-Firm cockpit HUD.
- README.md: Comprehensive institutional English documentation for GitHub and Algo Forge.
- Docs/ARCHITECTURE.md: Technical architecture specification with Mermaid lifecycle.
73 lines
2.2 KiB
MQL5
73 lines
2.2 KiB
MQL5
//+------------------------------------------------------------------+
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//| UIdStack.mqh |
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//| Copyright 2026, DearMQL5 GUI Engine |
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//| https://www.mql5.com |
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//+------------------------------------------------------------------+
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#property copyright "Copyright 2026, DearMQL5 GUI Engine"
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#property link "https://www.mql5.com"
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#property strict
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/// Hierarchical ID hashing stack for state retention and unambiguous widget identity.
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class UIdStack
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{
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private:
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static ulong s_stack[];
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static int s_stack_size;
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/// 64-bit FNV-1a string hashing algorithm.
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static ulong HashString(const string str, const ulong seed = 0xcbf29ce484222325)
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{
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ulong hash = seed;
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int len = StringLen(str);
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for(int i = 0; i < len; i++)
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{
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hash ^= (ulong)StringGetCharacter(str, i);
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hash *= 0x100000001b3;
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}
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return(hash);
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}
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public:
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/// Resets the ID stack to baseline at the beginning of each frame.
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static void Reset(void)
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{
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s_stack_size = 0;
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if(ArraySize(s_stack) < 16)
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ArrayResize(s_stack, 16);
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}
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/// Pushes a string namespace onto the ID stack.
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static void Push(const string str_id)
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{
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ulong parent_hash = (s_stack_size > 0) ? s_stack[s_stack_size - 1] : 0xcbf29ce484222325;
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ulong current_hash = HashString(str_id, parent_hash);
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if(s_stack_size >= ArraySize(s_stack))
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ArrayResize(s_stack, s_stack_size + 16);
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s_stack[s_stack_size++] = current_hash;
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}
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/// Pushes an integer index onto the ID stack.
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static void PushInt(const int int_id)
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{
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Push(IntegerToString(int_id));
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}
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/// Pops the topmost namespace from the ID stack.
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static void Pop(void)
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{
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if(s_stack_size > 0)
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s_stack_size--;
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}
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/// Computes the qualified unique ID hash for a widget label within current scope.
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static ulong GetId(const string label)
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{
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ulong parent_hash = (s_stack_size > 0) ? s_stack[s_stack_size - 1] : 0xcbf29ce484222325;
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return(HashString(label, parent_hash));
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}
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};
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ulong UIdStack::s_stack[];
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int UIdStack::s_stack_size = 0;
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