DIWNE::DiwnePanel ​

A rectangular area representing a part of a DIWNE object. More...

#include "DIWNE/Core/Layout/DiwnePanel.h"

Public Functions ​

Protected Functions ​

Protected Attributes ​

Detailed Description ​

class DIWNE::DiwnePanel;

class DIWNE::DiwnePanel;

A rectangular area representing a part of a DIWNE object.

See: DIWNE::Stack

Used for layouting, DiwnePanels support horizontal and vertical springs, which can be used to align fixed items within the panel. Note that this class is NOT a subclass of a DiwneObject. It is merely a utility class meant to be used within DIWNE objects.

DiwnePanels operate in DIWNE coordinates to be as view/zoom agnostic as possible. Unfortunately view position and zoom level still affects all coordinates due to ImGui pixel alignment.

Basic layout concept: DiwnePanel is a rectangle that tracks "fixed" size, which are parts of the rectangle that CANNOT shrink. Remaining size in the rectangle is considered "springy" and may be shrunk. Since the panel is tracking its fixed width (eg. it's minimal width), springs can be added within it that share some remaining available space. So to right align the panels content, a spring can be added to the beginning with a factor of 1.0f, making it use all the available space, right aligning the content. Similarly two springs with 0.5f factor each can be used to surround a fixed item and center it in the panel.

TODO: Better docs, examples etc.

DiwnePanels are meant to be a generic layout utility, but then need to work in "stable" coordinates. Hence they use DIWNE coordinates, which are converted from screen space using the provided editor reference. This incurs an extra runtime cost that wouldn't be necessary if used outside of the NodeEditor.

TODO: I might create a separate layout class for general ImGui if DiwnePanels prove useful

DiwnePanels themselves are merely a component of a larger layout system.

Public Functions Documentation ​

function DiwnePanel ​

DiwnePanel(
    NodeEditor & editor,
    std::string label
)

DiwnePanel(
    NodeEditor & editor,
    std::string label
)

function begin ​

void begin()

void begin()

function end ​

void end(
    DiwnePanel * parent =nullptr
)

void end(
    DiwnePanel * parent =nullptr
)

function expectWidthChangeThisFrame ​

void expectWidthChangeThisFrame(
    float width
)

void expectWidthChangeThisFrame(
    float width
)

Inform the next spring that a new fixed width item will appear this frame.

Can be used to prevent flickering on layout change.

function getAvailableSize ​

inline ImVec2 getAvailableSize() const

inline ImVec2 getAvailableSize() const

function getHeight ​

inline float getHeight() const

inline float getHeight() const

Returns real height of the diwne panel.

function getLastScreenRectDiwne ​

inline const ImRect & getLastScreenRectDiwne() const

inline const ImRect & getLastScreenRectDiwne() const

Returns the last screen space rectangle of this panel as reported by ImGui in the last end() call.

Warning: This rectangle is merely the last computed ImGui screen space rectangle. It does not have to correspond to getRect() and is only valid immediately after drawing, before layouting. Convert getRect() using screen2diwne to get a real screen space rect representation.

Can be used in special cases instead of the getRect() method to avoid unnecessary coordinate conversion.

function getMax ​

inline const ImVec2 & getMax() const

inline const ImVec2 & getMax() const

function getMaxX ​

inline float getMaxX() const

inline float getMaxX() const

function getMaxY ​

inline float getMaxY() const

inline float getMaxY() const

function getMin ​

inline const ImVec2 & getMin() const

inline const ImVec2 & getMin() const

function getMinimumHeight ​

float getMinimumHeight() const

float getMinimumHeight() const

Returns the minimum height of the panel.

Minimum height does not contain spring heights as those are willing to shrink if necessary.

function getMinimumSize ​

ImVec2 getMinimumSize() const

ImVec2 getMinimumSize() const

Returns the minimum size of the panel.

Minimum size does not contain spring sizes as those are willing to shrink if necessary.

function getMinimumWidth ​

float getMinimumWidth() const

float getMinimumWidth() const

Returns the minimum width of the panel.

Minimum width does not contain spring widths as those are willing to shrink if necessary.

function getMinMaxX ​

float getMinMaxX() const

float getMinMaxX() const

function getMinMaxY ​

float getMinMaxY() const

float getMinMaxY() const

function getMinX ​

inline float getMinX() const

inline float getMinX() const

function getMinY ​

inline float getMinY() const

inline float getMinY() const

function getRect ​

inline const ImRect & getRect() const

inline const ImRect & getRect() const

function getSize ​

inline ImVec2 getSize() const

inline ImVec2 getSize() const

Returns real size of the diwne panel.

function getWidth ​

inline float getWidth() const

inline float getWidth() const

Returns the real width of the diwne panel.

function layout ​

void layout()

void layout()

Recalculates the available spring size for the next frame, should be called after end() and after its preferred dimensions have been set.

function setHeight ​

void setHeight(
    float height
)

void setHeight(
    float height
)

function setMax ​

inline void setMax(
    const ImVec2 & max
)

inline void setMax(
    const ImVec2 & max
)

function setMaxX ​

inline void setMaxX(
    float x
)

inline void setMaxX(
    float x
)

function setMaxY ​

inline void setMaxY(
    float y
)

inline void setMaxY(
    float y
)

function setMin ​

inline void setMin(
    const ImVec2 & min
)

inline void setMin(
    const ImVec2 & min
)

function setMinX ​

inline void setMinX(
    float x
)

inline void setMinX(
    float x
)

function setMinY ​

inline void setMinY(
    float y
)

inline void setMinY(
    float y
)

function setRect ​

inline void setRect(
    const ImVec2 & min,
    const ImVec2 & max
)

inline void setRect(
    const ImVec2 & min,
    const ImVec2 & max
)

function setWidth ​

void setWidth(
    float width
)

void setWidth(
    float width
)

Sets the width of the panel, extending the rectangle to the right.

Or shrinking to the left.

function spring ​

bool spring(
    float relSize,
    bool horizontal =true
)

bool spring(
    float relSize,
    bool horizontal =true
)

Adds a horizontal (or vertical) spring (dummy item) with width/height calculated based on remaining available width in the panel.

Parameters:

• relSize Proportion of the available width/height this spring ends up using
• horizontal True for a horizontal spring, false for a vertical spring.

Return: Whether the spring item was truly added or not.

Warning: Springs operate in a single dimension, eg. in a single line, single "column". The space they span isn't meant to be occupied by another item. If you, for example, need several horizontal springs above each other, use multiple DiwnePanels and a layout manager like VStack.

function translate ​

inline void translate(
    const ImVec2 & v
)

inline void translate(
    const ImVec2 & v
)

function vspring ​

bool vspring(
    float relSize
)

bool vspring(
    float relSize
)

Vertical spring.

See: spring()

Protected Functions Documentation ​

function beginFixedItem ​

void beginFixedItem()

void beginFixedItem()

function endFixedItem ​

void endFixedItem()

void endFixedItem()

function reset ​

void reset()

void reset()

Protected Attributes Documentation ​

variable hsprings ​

int hsprings = 0;

int hsprings = 0;

variable m_availableSpringSize ​

ImVec2 m_availableSpringSize;

ImVec2 m_availableSpringSize;

Total width/height that can be filled with springs, in DIWNE coordinates.

variable m_editor ​

NodeEditor & m_editor;

NodeEditor & m_editor;

Reference to the overarching node editor.

variable m_fixedSize ​

ImVec2 m_fixedSize;

ImVec2 m_fixedSize;

Cumulative size of fixed items within the panel. The minimum size.

variable m_label ​

std::string m_label;

std::string m_label;

ImGui label used for identification.

variable m_lastFixedPositionXY ​

ImVec2 m_lastFixedPositionXY;

ImVec2 m_lastFixedPositionXY;

Internal variable for tracking the fixed items size automatically.

variable m_lastScreenRect ​

ImRect m_lastScreenRect {ImRect()};

ImRect m_lastScreenRect {ImRect()};

Last screen space rectangle reported by ImGui.

See: getLastScreenRectDiwne()

Used in special cases.

variable m_rect ​

ImRect m_rect {ImRect()};

ImRect m_rect {ImRect()};

Actual rect including any extra spacings that can shrink. In DIWNE space.

variable vsprings ​

int vsprings = 0;

int vsprings = 0;

Updated on 2026-05-21 at 15:39:36 +0000