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And some say it's still using desktop computers, even to this day 👻
Phantom is a QStyle for Qt which began as an overhaul of QFusionStyle. Similar to Fusion, it's designed to be a looks-the-same cross-platform style. It looks native to nobody, but familiar to many. It has the visual appearance of a traditional GUI, and does not adopt a "modern flat" style. Compared to Fusion, it has many fixes, objective improvements, and subjective improvements:
src/phantom/phantom.pri to your qmake .pro file for your project. There
are no additional dependencies. It's also safe to construct a PhantomStyle
object before instantiating a QApplication, because it doesn't interact with
the environment or anything else.
A style plugin is available: phantomstyleplugin.pro
Tested on Qt 5.9 and later, but should work on earlier versions as well. Builds with MSVC (tested with 2017), GCC and clang.
auto from C++11, so C++11 is needed. C++14 and later are not needed.
Fixed many code and logic errors: unaligned reads/writes, dead and unreachable code paths, redundant allocations, unused variables.
Fixed many drawing mistakes: filled regions which are never seen, off-by-1 and misalignment, unnecessary QPainter transformations, unnecessary use of anti-aliasing for solid rectangles, misaligned arrows in scrollbar buttons and spinboxes, garbage lines and artifacts in the grooves of scrollbars.
Fixed bad drawing at high DPI: QPen lines which are misaligned, incorrect line thickness, broken and interrupted lines between connected elements (tabs and tab bars, etc.), misaligned or disconnect outlines and their associated inner fills, incorrect scaling of certain parts of a shape and others unscaled, unnecessary use of QPen anti-aliased lines to draw straight rectangles of constant width.
Fixed bad drawing in right-to-left layout: borders and outlines on the wrong side of rectangles (headers in item views, spinboxes, line edit borders), edges and off-by-1 adjustments made to bounding rectangles (tab frame and tab shapes, menu bar rulers, toolbar separators, grip handles), misalignment of icons and shapes (indicators in menu items, check boxes, radio button labels), clipped and invisible text (progress bar labels.)
Fixed broken metrics and sizing calculations for menu items, which over time lead to QFusionStyle having to have more and more "safety space" added to the horizontal size of menu items to avoid clipping stuff off. Phantom has correct sizing of menu items, and doesn't make menus any wider than necessary.
Replaced many constant sizes and pixel metrics with font-based calculations: menu items (and more) now derive their metrics from the font being used, so that they look more consistent across platforms which may use fonts for menus that are distinct from other widgets. A constant, even when DPI scaled, may give too little or too much space when the font size varies across a larger range than you predicted.
Removed all use of QPixmapCache.
QFusionStyle would aggressively cache the results of drawing certain shapes (buttons shapes, for example) based on the input parameters of the style option (size, state, palette, etc.) While this would speed up subsequent repaints with the same input parameters, the initial painting is slower.
QFusionStyle's use of QPixmapCache would lead to full occupancy of the global QPixmapCache almost immediately: create a window with a few buttons, then drag-resize the window. Within a few moments, all 10 megabytes of the default QPixmapCache have been filled. Not only does this bloat memory usage if the QPixmapCache would otherwise not have been used, but it causes legitimate uses of the QPixmapCache to have their contents evicted on a regular basis.
QFusionStyle's use of QPixmapCache requires allocating and deallocating string keys alongside what should have been simple painting operations.
QFusionStyle's generated cache keys were too fragile: in several cases, the cached pixmap would never be re-used, because the calculated cache key would never be the same on subsequent calls to draw the widget.
PhantomStyle draws significantly faster than QFusionStyle, and the caching is no longer needed.
Removed all use of gradients and explicit alpha blending.
QPainter has no color management, and on pixel buffers, blends in unmanaged 8-bit color. This means that blending operations between two colors (for example, a gradient, or an alpha blend of one color on top of another) produce unintuitive results. While your gradient that you chose and tested with a light color scheme might appear fine, when used with a QPalette with darker colors, the results may have far too little or too much contrast. Hue shifting and unintended darkening or lightening also may occur.
QPainter has no dithering capabilities, so banding would occur.
QPainter's gradients and alpha blending are slow.
The alpha blending done by QFusionStyle was almost always between two constant colors that were known ahead of time, such as a shadow on top of a base color, or a groupbox background on top of a window. The resulting blended color could instead simply be calculated ahead of time and painted as a solid rectangle, which is faster and can be color-corrected.
Overuse of gradients makes QFusionStyle look like it's from a specific time period (mid-2000s) instead of no time period at all.
Note that hue shifting and lightness shifting will still occur on the edges of anti-aliased shapes, like roundrect corners. This can only be solved by QPainter being changed to perform color-correct blending.
Changed derived color calculations to use CIELUV-like colorspace
QColor's .darker() and .lighter() were used by QFusionStyle to calculate derived colors from another color. For example, outlines on a box, or highlights on the inside of edges. QColor's .darker(), .lighter(), .lightness(), and other functions have no rigor or defined meaning -- the numbers are arbitrary and the output is unpredictable except when the input color is similar to whatever the programmer or designer tested it with. Using .lighter(120) on a near-black color will produce a different amount of contrast than .lighter(120) on a brighter color.
PhantomStyle instead uses a pseudo-CIELUV colorspace to derive its colors, provided by some core code from the hsluv-c library. While not perfect, it's a significant improvement, and allows PhantomStyle to more consistently work with both light and dark QPalettes.
Removed many implicit QPen and QBrush allocations caused by calling setBrush() and setPen() with QColor arguments. Instead, QPen and QBrush instances are now persisted in a small cache (in small flat array, not a QHash) that uses an accurate QPalette hash key calculation. (QPalette::cacheKey() is not used, because it is prone to changing even when the underlying values are the same.) This saves many, many small heap allocations that would occur when QFusionStyle was performing painting operations.
Disabled and removed most mouse-over/hover repainting.
QFusionStyle, for many widgets, would paint with different colors when the user moused over certain elements, like buttons. However, on modern composited desktops and especially when combined with event coalescing and hardware-accelerated mouse drawing that skips the main compositing path, this would cause the repainting of widgets to appear to occur long after the mouse had already passed over the widget. The result would be a subtle and persistent feeling of lag throughout in the UI.
For some widgets, QFusionStyle's alternate painting in the mouseover state was either not noticeable or identical, resulting in redundant repainting and event dispatching as the user moved their mouse cursor across the UI.
Qt::WA_Hover and alternate painting is still used where it makes good
sense: menu items, tool buttons, and a few other cases.
Fixed style hints which affected the operation of QMenus.
SH_Menu_SloppySubMenus, but didn't also specify that the submenus should not be closed after a timeout if nothing else is moused over (
SH_Menu_SubMenuDontStartSloppyOnLeave). It also did not specify
SH_Menu_SubMenuUniDirectionand several other hints which should have been specified, which would cause the reactions of a QMenu to appear to lag behind the user's movements or to close submenus unnecessarily.
Fixed QMenuBar items not being highlighted when in alt-key navigation mode.
SH_MenuBar_AltKeyNavigation) but did not actually draw the focused or highlighted menu bar item after the user had tapped the alt key. This would cause Windows and Linux users to assume that alt key navigation did not work in the program (because it had no visible indication that alt key navigation mode had been entered) when in fact it actually did have an effect, and would also cause the subsequent keypress on the keyboard to be eaten by the QMenuBar.
Altered the metrics of many widgets so that they align correctly.
Combo boxes are now the same height as push buttons, instead of being off-by-1-or-2.
Spinboxes are now the same height as line edits.
Decorations in item view items are now the same height as a line of text by default, so that decorated and undecorated items do not have differing row heights. (Manual specification of decoration size still works.)
Check marks and radio indicators are now visible alongside the icons in menu items, if both are specified.
The border around the "current" item in an item view is now drawn in a way that is actually visible, and is only drawn if necessary. The "current" focus rect will not be drawn if there there is only one item selected and the selected item is also the current item.
Added editable, compile-time parameters that control the styling of various things by editing a single constant in the source file:
Ratios for font-derived spacing and margins in menu items, line edits, check boxes, etc.
Separate and controllable roundrect radius for many widgets: group boxes, buttons, tool buttons, etc.
An alternate, faster code path using solid rect fills instead of anti-aliased roundrect is taken when a widget's rounding is set to 0 or near-0.
Internal "sunken" shadows on some large widgets (line edit, spinbox, progress bar) can be enabled or disabled.
Internal shadow can also be enabled or disabled for checkboxes and radio buttons.
Shadows in scrollbars can be enabled or disabled.
Tree view branch indicators can be made flush to the margin of the view (Classic Mac OS style) or aligned to the text of the item.
Item view decorations can be included in the visibly selected region or not.
Auto-raise for tool buttons in a tool bar by default can be enabled or disabled.
Use of QMenu or the Windows-style disclosure menu for combo boxes can be enabled or disabled.
Default decoration sizes based on fonts for item views can be enabled or disabled (when disabled, uses the default small pixmap size.)
No use of private Qt classes or code.
No warnings when building with -Wall.
I would prefer to give it a more permissive license, or the same license that the official code Qt has, which allows commercial projects to use the code without LGPL restrictions if they have a Qt license. However, I don't know how to do this, and I don't have time at the moment to figure it out. Please contact me or open a ticket if you can help with this. The PhantomStyle code originally started as a copy-and-paste of the Fusion code, but nearly none of the Fusion code remains at this point (just some stuff for drawing MDI window decorations and QDial.)
Phantom Style Copyright (C) 2019 Andrew Richards This library is free software; you can redistribute it and/or modify it under the terms of the GNU Library General Public License as published by the Free Software Foundation; either version 2 of the License, or (at your option) any later version. This library is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Library General Public License for more details. You should have received a copy of the GNU Library General Public License along with this library; if not, write to the Free Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA.